【題目】It was ________ that we tried to make him change his mind.

A. paid off B. in vain

C. took off D. in effect

【答案】B

【解析】考查動詞短語及介詞短語辨析。A. paid off “付清；成功，有回報(bào)（Sth pay off.）”；B. in vain“徒勞”；C. took off “脫下；起飛”D. in effect“（指規(guī)則、法律等）生效，實(shí)際上”，所以該句It為形式主語，that引導(dǎo)真實(shí)的主語從句，該句句意：“我們盡力使他改變主意是徒勞的。”，故正確答案為B.

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