A
这句话的主语是number
since是一个非常明确的时间状语 有since 必然接完成时
The number of college students in China_ gre atly since 1990
The number of college students in China_ gre atly since 1990
A has increasedB have increased C are increased D was increased
A has increasedB have increased C are increased D was increased
英语人气：501 ℃时间：2019-12-10 18:06:13
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