【题目】He was observed ________ into the house before the owner came back.
A．to slip
B．slip
C．slipping
D．slipped
在线课程【答案】A
【解析】有人看到他在主人回来之前,溜进屋子.题干中用了observe sh do sth 的被动形式 be observed to do sth.
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