______in universities around the nation has more than tripled compared to this time last year.

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问题 ______in universities around the nation has more than tripled compared to this time last year.

选项 A、Enroll
B、Enrolls
C、Enrolling
D、Enrollment

答案D

解析 本题要求选择enroll的适当词形。横线处是主语,谓语是has more than tripled,因此排除动词(A)enroll和(B)enrolls。动名词(C)enrolling可以作主语,但表示的是“报名”这个行为,与has more than tripled(是三倍多)在意义上无法衔接,故答案是名词(D)enrollment(入学人数)。
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