【題目】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:警察試圖驅(qū)散抗議的人群，但沒有成功。in vain是固定搭配，意為“白白地，毫無結(jié)果，白費(fèi)力氣”。

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