国家开放大学 / 综合英语（3）
正确率：100%
He kept _ _ _ _ _ _ to his parents.
A.putting off to write
B.to put off to write
C.putting off writing
D.to put off writing
A.putting off to write
B.to put off to write
C.putting off writing
D.to put off writing
参考答案：
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