问题补充：
It’s hard to keep the house with three kids.
A. cleaning
B. to clean
C. cleaned
D. clean
答案：
A. cleaning
B. to clean
C. cleaned
(答案→)D. clean
解析：句意：有三个孩子很难保持房子干净。考查keep+宾语+形容词宾补，clean
，形容词，干净的。所以选D。
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