What the science teacher does and says _________ of great importance to college students.

A.was                     B. are                      C. is                      D. were

C 


解析:

主語(yǔ)從句作主語(yǔ)，謂動(dòng)作單數(shù)；does and says 提示時(shí)態(tài)應(yīng)為一般現(xiàn)在時(shí)。

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