All his attempts to unlock the door were, because he was using the wrong key.A．in returnB．in vainC．in doubtD．in time-高中英语-n多题

◎ 题干

All his attempts to unlock the door were , because he was using the wrong key.

A．in return

B．in vain

C．in doubt

D．in time

◎ 答案

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◎ 解析

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◎ 知识点

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