问题
选择题
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
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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