We'll learn much from this failure, so our suffering and efforts are not ________.
A．in returnB．in vain
C．a(chǎn)t randomD．a(chǎn)t all costs
B
B 考察介詞短語辨析。In return作為回報(bào)；in vain白費(fèi)地，徒勞地；at random任意地，隨便地；at all costs不惜任何代價(jià)的。句義：完美將從這次失敗中學(xué)到很多，因此完美所忍受的痛苦和付出的努力沒有白費(fèi)。故B正確。
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