The missing boys were last seen ________ near the river.
A. playing
B. played
C. play
D. to play
The missing boys were last seen ________ near the river.
A. playing
B. played
C. play
D. to play
A
所填的词为主语补足语，因其后有明确的地点，补足语表示动作当时正在进行中，所以只能使用 playing 。
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