30.If he __harder,he will catch up with us soon.A study B studies_英语解答

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..

人气：413 ℃　时间：2019-10-29 06:29:08

解答

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.