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-The comrade has finished the work on the machine. -He throughout the night! A.

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-The comrade has finished the work on the machine. -He throughout the night! A.

—Thecomrade has finished the work on the machine.

—He________ throughout the night!

A.can have been working   B.must have worked

C.must work    D.must have been working

 

试题答案

答案：D

提示：

havebeen doing 一直作某事。

 

标签：workthemachineoncomrade

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