30.If he __harder,he will catch up with us soon.A study B studies C will study D studied.顺便说明理由..

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30.If he __harder,he will catch up with us soon.A study B studies C will study D studied.顺便说明理由..
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30.If he __harder,he will catch up with us soon.A study B studies C will study D studied.顺便说明理由..
30.If he __harder,he will catch up with us soon.
A study B studies C will study D studied
.顺便说明理由..

30.If he __harder,he will catch up with us soon.A study B studies C will study D studied.顺便说明理由..
if条件从句的主句用将来时,从句用现在时表将来时,故选studies.

B
If clause(现在式),main clause(will+V原形)
表可能发生的事

B

B