单项选择题

A knock at the door again! It was the third time someone ______ me that evening.

A. has interrupted
B. had interrupted
C. to have interrupted
D. would have interrupted
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We agree to accept ______ they thought was the best tourist guide.
A. whatever
B. whomever
C. whichever
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Could you tell me ______ the population of our city is
A. how much
B. how many
C. how many people
D. what
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