摘要：If he harder, he will catch up with us soon.
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If he ________ harder, he will catch up with us soon.
- A.study
- B.studies
- C.will study
- D.studied
If he ________harder , he will catch up with us soon .
A. study B. studies C. will study D. studied
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If he ________harder , he will catch up with us soon .
| A． study | B．studies | C．will study | D．studied |