What the teacher of the science class does and says______of great importance to

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问题 What the teacher of the science class does and says______of great importance to the students at college.

选项 A、was
B、are
C、is
D、were

答案 C

解析本题考查的是当句子主语为从句时，谓语的单复数形式。该句的主语是what引导的名词性从句，因此谓语动词应该用单数形式。本题答案为C。

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