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More than a dozen students in that school ______ abroad to study medicine last year.

A. sent        B. were sent       C. had sent       D. had been sent

More than a dozen students in that school      abroad to study medicine last year.

A.sent                          B.were sent

C.had sent                      D.had been sent

More than a dozen students in that school______abroad to study medicine last year.

A.sent                                 B.were sent

C.had sent                           D.had been sent

More than a dozen students in that school        abroad to study medicine last year.

       A．sent                    B．were sent            C．had sent              D．had been sent

More than a dozen students in that school ____ abroad to study medicine last year.