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..

分类: 作业答案 • 2022-01-02 15:57:47

问题描述：

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..

答