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(xiǎn)中；in turn反過(guò)來(lái)；in return作為報(bào)答；in vain白費(fèi)力氣，徒勞無(wú)益。句意：他們需要有很大的勇氣承認(rèn)自己的一切努力全是徒勞的。]

 

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