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 _______ is mentioned above that the number of the students in senior high schools is increasing.

   A. Which         B. As            C. That             D. It

       is mentioned above，the number of the students in senior high schools is increasing.

   A.Which            B.As                  C.That          D.It

__________is mentioned above，the number of the students in senior high schools is increasing.

   A.Which            B.As                  C.That          D.It

        is mentioned above，the number of the students in senior high schools is increasing.

   A.Which            B.As                  C.That          D.It

 ____ is mentioned above, the number of students in senior high schools is increasing.

   A. What                       B. That                      C. Which                   D. As