Question

We'll learn much from this failure, so our suffering and efforts are not ________.

A．in return	B．in vain
C．at random	D．at all costs

Answer 1

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。