What the teacher of the science class does and says ______ of great importance t

游客2025-03-25 7

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

解析该句的主语是一个以what引导的名词性从句，其谓语必须是单数。

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