（） in universities around the nation has more than tripled compared to this time last year.

A:Enroll B:Enrolls C:Enrolling D:Enrolhnent

（） in universities around the nation has more than tripled compared to this time last year.

A:Enroll B:Enrolls C:Enrolling D:Enrolhnent

（） in universities around the nation has more than tripled compared to this time last year.

A:Enroll B:Enrolls C:Enrolling D:Enrolhnent

（） in universities around the nation has more than tripled compared to this time last year.

A:Enroll B:Enrolls C:Enrolling D:Enrolhnent

（） in universities around the nation has more than tripled compared to this time last year.

A:Enroll B:Enrolls C:Enrolling D:Enrolhnent