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    His sister left home in 1998, and since then. A. had not been heard of B. has not been heard of C. had not heard of D. has not heard of 【查看更多】

     

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     His sister left home in 1998 and ________ since then.

    A．had not been heard of          B．has not been heard of

    C．had not heard of              D．has not heard of

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