选 B,这道题运用的是过去时的被动语态,一般过去时的被动语态的结构是：
was /were +过去分词,同时被动语态中原来的see sb. do sth.要变成 see sb. to do sth.
不知这样讲,你清楚了没?
The children _______ basketball in the playground sometimes.A.were seen playB.were seen to play
The children _______ basketball in the playground sometimes.A.were seen playB.were seen to play
C.have seen to play D.have seen play
C.have seen to play D.have seen play
英语人气：774 ℃时间：2019-08-20 15:18:36
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