The missing boys were last seen ________ near the river.-查字典考试网

The missing boys were last seen ________ near the river.

A、playing
B、played
C、play
D、toplay

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正确答案：

答案解析：

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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