It took a great deal of courage to admit that all their efforts had been ________.

A.in danger B.in vain

C.in return D.in turn

 

B

【解析】B [in danger處于危險中;in turn反過來;in return作為報答;in vain白費力氣,徒勞無益。句意:他們需要有很大的勇氣承認自己的一切努力全是徒勞的。]

 

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