If they ______ more aware of the trends, they could have avoided bankruptcy.

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问题 If they ______ more aware of the trends, they could have avoided bankruptcy.

选项 A、were
B、are
C、have been
D、had been

答案D

解析 Had been is the correct past perfect verb for a past unreal condition in an if clause. Choice (A) is the past tense. Choice (B) is the simple present. Choice (C) is the present perfect.  
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