题文
Happily for Johns mother, he is working harder to ______ his lost time.
| A．make up for | B．keep up with |
| C．catch up with | D．make use of |
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Happily for Johns mother, he is working harder to ______ his lost time.
| A．make up for | B．keep up with |
| C．catch up with | D．make use of |
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