问题补充：
Look! The houses .
A. is being built
B. are building
C. being built
D. are being built
答案：
A. is being built
B. are building
C. being built
(答案→)D. are being built
解析：本题考查被动语态。由look可知此处动词表示的动作正在进行，主语与所选词是被动关系；houses做主语，谓语动词用复数形式，由此可知本题选D。
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