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    8．All of sudden, layers of dark clouds gathered round and the sailors were at mercy of the coming hurricane. A．a; / B．a; the C．the; / D．the; the 【查看更多】

     

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    All of _________ sudden, layers of dark clouds gathered round and the sailors were at _________ mercy of the coming hurricane.

    A. a; /                          B. a; the                      C. the; /                D. the; the

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