【題目】I have done everything possible to prevent him from running the risk but ______.

A. in time B. in case C. in vain D. in need

【答案】C

【解析】

試題分析：考查固定搭配。A. in time及時(shí)；B. in case以防萬一；C. in vain徒勞；D. in need需要。句意：我盡了一切可能(我已經(jīng)做了一切可能做的事情)來阻止他去冒險(xiǎn)，但這只是徒勞的。故選C。

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