2. 外语
  3. He must be in the building because he was seen ______ the building just now.

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

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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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