选择A
理由 see somebody doing 是固定结构,无论see用的主动形式还是被动形式都用doing；
答案可能依据的是see sb do由主动变被动时要加上不定式符号to.
供参考.
the missing boys were last seen 空格 near the river; a:playing ; b:to be playing,
the missing boys were last seen 空格 near the river; a:playing ; b:to be playing,
我这儿的答案是b,
我这儿的答案是b,
英语人气：346 ℃时间：2019-08-20 16:35:59
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