As we came to the work site, the workers were seen _______the new house.
A．buildingB．build C．builtD．to build
A
考查非謂語動詞。本題考查see sb doing結(jié)構(gòu)，用其被動語態(tài)即為sb be seen doing。句意：當我們來到工地的時候，我們看到工人正在建新房子。
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