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    精英家教网 > 高中英语 > 题目详情
    It took a great deal of courage to admit that all their efforts had been ________.
    A．in dangerB．in vain
    C．in returnD．in turn
    B
    B　[in danger处于危险中；in turn反过来；in return作为报答；in vain白费力气，徒劳无益。句意：他们需要有很大的勇气承认自己的一切努力全是徒劳的。]
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