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His sister left home in 1998 and since then. A.had not been heard of B.has not b

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His sister left home in 1998 and since then. A.had not been heard of B.has not b

 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

试题答案

B