He ______ trees in his garden just now.

A. was seen planting
B. was seen plant
C. is seen to plant
D. has been seen to plant
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科目:初中英語 來源:模擬題 題型:單選題

He ______ trees in his garden just now.
[     ]
A. was seen planting
B. was seen plant
C. is seen to plant
D. has been seen to plant

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