______ impossible to make a living in real estate, Nancy added insurance as a side line.

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问题 ______ impossible to make a living in real estate, Nancy added insurance as a side line.

选项 A、It’s being
B、Its being
C、It is
D、It being

答案D

解析 本题考查独立主格结构。it是分词being的逻辑主语。
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