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The computer centre, ____ last year , is very popular among the students in this school.

The computer centre, ____ last year , is very popular among the students in this school.

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

 The computer centre, ______ last year is very popular among the students in this school.

 The computer centre,______last year, is very popular among the students in this school.
A. open     B. opening      C.having opened      D. opened