He must be in the building because he was seen ______ the building just now.A、en

游客2023-10-04  22

问题 He must be in the building because he was seen ______ the building just now.

选项 A、entering
B、enter
C、to enter
D、having entered

答案 C

解析 本题考查非谓语动词不定式的用法。表示感官的一些动词如:see,hear,watch, notice等后面需接不带to的动词不定式做宾语补足语,与宾语一起构成复合宾语。但在这些词用作被动结构时,省去的to需加上,不定式做主语补足语。如:The workers are made to work from day to night.
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