What the science teacher does and says       of great importance to college students.
A．a(chǎn)reB．isC．wereD．was
B

試題分析：考查謂語動詞單復數(shù)，句子作主語時，謂語動詞用單數(shù)，句子意思“學科老師所做的和所說的對于大學生很重要”，所以選B
點評：句子What the science teacher does and says是個從句，引導詞是what，做整個句子的主語，短語of great importance相當于一個形容詞important。
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