单项选择题

There is no doubt（）Herbert is the most industrious student in our class.

A. whether
B. what
C. that
D. if

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单项选择题
Why does the man want to see the manager（）

A. He isn’t satisfied with the woman’s answer.
B. He is angry.
C. He is sad.
D. He is happy.
单项选择题
Kevin is the only student in the class（）failed in the exam.

A. who
B. that
C. which
D. whom
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