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We'll learn much from this failure, so our suffering and efforts are not ________.
A.in returnB.in vain
C.at randomD.at all costs
B
B 考察介词短语辨析。In return作为回报;in vain白费地,徒劳地;at random任意地,随便地;at all costs不惜任何代价的。句义:完美将从这次失败中学到很多,因此完美所忍受的痛苦和付出的努力没有白费。故B正确。
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