题目内容

___for two days, Steve managed to finish his report on scheduled.

A. To work
B. Worked
C. To be worked
D. Having worked

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Like ancient sailors,birds can find their way___the sun and the stars.

A. used
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A. Supposing
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C. Supposed
D. Having supposed

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A. bathed
B. bathing
C. to have bathed
D. having bathed

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A. 简报型商务信息
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