a new house is impossible for the young couple because they haven't saved enough moneyA.

问题补充：

a new house is impossible for the young couple because they haven saved enough money．

A. Buy

B. Buying

C. Bought

D. Having bought

答案：

A. Buy

(答案→)B. Buying

C. Bought

D. Having bought

解析：句意：对年轻的夫妇来说买一个新房子是不可能的，因为他们没有攒够足够的钱。这里的is impossible是谓语，前面的内容是主语，用动名词做主语，所以选B。

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