2. 外语
  3. All their efforts to solve the problem proved futile.

All their efforts to solve the problem proved futile.

admin2012-10-23  38
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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