The children _______ basketball in the playground sometimes.A.were seen playB.were seen to play

问题描述:

The children _______ basketball in the playground sometimes.A.were seen playB.were seen to play
C.have seen to play D.have seen play

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?