He saw a boy _____ on the truck when he got off the train.

A. played
B. to play
C. playing
D. is playing
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科目:初中英語 來源:同步題 題型:單選題

He saw a boy _____ on the truck when he got off the train.
[     ]
A. played
B. to play
C. playing
D. is playing

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