The missing boys were last seen near the river. [ ] A．playingB．to be playingC．pl
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The missing boys were last seen ________ near the river.
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A．playingB．to be playingC．playD．to play
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答案：
解析：“最后小孩被看见正在河边玩”强调小孩当时的情况see sb. doing看见某人正在干某事（强调动作正在发生、进行）see sb. do看见某人做了某事（强调动作的全过程） |