单项选择题

He tried several times to pass the exam. () the end, he succeeded.

A. On
B. In
C. At
D. By

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单项选择题
Fred: Hi, Paul, do you live near there Paul: () I moved out to the suburbs.

A. Hi, Fred, how do you do
B. Hi, Fred, I’m very well, thanks.
C. Yes, I do.
D. No, I don’t.

单项选择题
How these big stones were moved to the mountain tops remains a (), that is, nobody knows how.

A. mystery
B. possibility
C. responsibility
D. faith

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