All his attempts to unlock the door were   , because he was using the wrong key.
A．in returnB．in vainC．in doubtD．in time
B
考查短語(yǔ)辨析。in return 作為回報(bào)，in vain 白費(fèi)力，白辛苦，in doubt 懷疑的，in time 及時(shí)，句意：打開(kāi)這個(gè)門(mén)的所有努力白費(fèi)了，因?yàn)樗缅e(cuò)了鑰匙。所以選B。
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