2. 外语
  3. What the teacher of the science class does and says ______ of great importance to the students at college.

What the teacher of the science class does and says ______ of great importance to the students at college.

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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 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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