问题补充:
As we came to the work site, the workers were seen the new house.
A. building
B. build
C. built
D. to build
答案:
(答案→)A. building
B. build
C. built
D. to build
解析:考查非谓语动词。本题考查see sb doing结构,用其被动语态即为sb be seen doing。句意:当我们来到工地的时候,我们看到工人正在建新房子。
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