单项选择题

Mr. Black is the professor（）I have the greatest respect.

A. to whom
B. for whom
C. whom
D. who

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单项选择题

—She was late for the party. —That's（）she had forgotten the exact time.

A. why
B. how
C. because
D. whethe

单项选择题

Do you know（）they are getting on well with the project

A. whether
B. what
C. how
D. when

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