"Had decided" is the correct option because it is in the past perfect tense, which is used to describe an action that was completed before another action or point in time in the past. In this sentence, the meeting was held yesterday, and the committee had already decided to make a decision by the end of the month. So, the action of deciding was completed before the meeting was held.
Option "decided" is incorrect because it is in the simple past tense, which is used to describe an action that was completed in the past, but it does not indicate when the action was completed.
Option "has decided" is incorrect because it is in the present perfect tense, which is used to describe an action that was completed at an unspecified time before now, but it does not indicate when the action was completed with respect to the meeting.
Option "was decided" is incorrect because it is in the past passive form, which is used to describe an action that was done to someone or something, but it does not indicate who or what did the action.
C2 | Proficiency
C2 is the highest level in the CEFR framework — the proficiency stage, where your English is nearly indistinguishable from a well-educated native speaker's. C2 users handle irony, understatement, and idiomatic range across any register, and they reformulate ideas under pressure without losing fluency.
C2 is less about learning new grammar and more about mastering the flexible, context-sensitive use of everything you already know. Most learners never reach C2 — and most don't need to. Knowing the level helps you set realistic goals: B2 or C1 is plenty for almost any practical purpose.
C1 | Advanced
C1 is the advanced level in the CEFR framework, sitting between B2 and C2. At C1 you stop translating in your head and start thinking in English — handling specialised articles outside your field, picking up implicit meaning, and writing structured arguments on complex topics.
Grammatically, C1 means natural use of inversion (Rarely have I seen…), mixed and advanced conditionals, subjunctive forms in formal contexts, and cleft sentences for emphasis. Most university programmes for non-native speakers and many professional certifications set C1 as their entry standard.
Difficulty: Hard
The Hard difficulty tag marks questions and challenges aimed at upper-intermediate to advanced learners — typically B2 and above. Expect interacting rules, edge cases, distractors that look right at first glance, and contexts where the surface meaning and the grammatical answer don't match.
Filter by Hard when you're past the basics and want material that genuinely tests your understanding. These questions catch the gaps your textbook didn't — register-sensitive choices, exception cases, mixed conditionals, the difference between would have been and had been.