John was seen in by the back door but nobody saw him .A. to come…to leaveB. come… leaveC

问题补充：

John was seen in by the back door, but nobody saw him .

A. to come…to leave

B. come… leave

C. to come… leave

D. come…leaving

答案：

A. to come…to leave

B. come… leave

(答案→)C. to come… leave

D. come…leaving

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