All their efforts to solve the problem proved futile.

admin2012-10-23  30

问题 All their efforts to solve the problem proved futile.

选项 A、useless
B、undesirable
C、unnecessary
D、worthless

答案A

解析 A.useless无用的无价值的;B.undesirable不合乎社会道德标准的,不受欢迎的;C.unnecessary不必要的,多余的;D.worthless无价值的,无足轻重的。
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