[题目]The police tried to break up the protest crowds. A. in vain B. on vain C. at vain D. with vain 题目和参考答案——青夏教育精英家教网—

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【题目】The police tried _________ to break up the protest crowds.

A. in vain B. on vain

C. at vain D. with vain

【答案】A

【解析】句意:警察试图驱散抗议的人群，但没有成功。in vain是固定搭配，意为“白白地，毫无结果，白费力气”。

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