13.About 90 percent of the equipment presented by the administration,as well as the facilities of our own, ______made good use of in teaching.
A.have | B.has | C.have been | D.has been |
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13.About 90 percent of the equipment presented by the administration,as well as the facilities of our own, ______made good use of in teaching.
A.have | B.has | C.have been | D.has been |