【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】考查固定搭配。A. in time及時(shí)；B. in case以防萬(wàn)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(lái)阻止他去冒險(xiǎn)，但這只是徒勞的。故選C。

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