-Have they started building a house for you? -Yes, it now. [ ] A. is building B.
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![-Have they started building a house for you? -Yes, it now. [ ] A. is building B.](/pic/43_773622.jpg)
-Have they started building a house for you?
-Yes, it ________ now.
[]A.is building
B.has built
C.has started
D.is being built
试题答案
答案:D
解析:由now可知,用现在进行时态。主语是it,应该用被动结构。