单选题：Happily for John's mother,he is working harder to _________

题目内容：

Happily for John's mother,he is working harder to __________ lost time. A．make up for
B．keep up with
C．catch up with
D．make use of

参考答案：【答案仅供学习，请勿对照自行用药等】

答案解析：

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