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The computer center, ________ last year, is very popular among the students in this school.

The computer center, ________ last year, is very popular among the students in this school.

A. open?????? ??? B. opening???????? C. have opened????? D. opened

The computer center, ________ last year, is very popular among the students in this school.

A．open             B．opening           C．have opened       D．opened

The computer center, ___________ last year, is very popular among the students in this school.

A. open　 　　　 B. opening

C. having opened　 D. opened

The computer center, ___________ last year, is very popular among the students in this school.

A. open　 　　　 B. opening

C. having opened　 D. opened