问题
选择题
What the science teacher does and says _________ of great importance to college students.
A．was
B．are
C．is
D．were
答案
C
主语从句作主语，谓动作单数；does and says 提示时态应为一般现在时。
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What the science teacher does and says _________ of great importance to college students.
A．was
B．are
C．is
D．were
C
主语从句作主语，谓动作单数；does and says 提示时态应为一般现在时。