Question

【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

Answer 1

【答案】C
【解析】考查固定搭配。A. in time及時；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(我已經做了一切可能做的事情)來阻止他去冒險，但這只是徒勞的。故選C。