单项选择题

I don't remember ______ to Professor Brown during my last visit to Harvard.

A. having introduced
B. having been introduced
C. to have introduced
D. to have been introduced
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单项选择题
______ surprised me most was to see some of the villagers seated on the benches in the corner.
A. What
B. Which
C. That
D. It
单项选择题
This is the second time that John __________ in his final exam.
A. has failed
B. fails
C. failed
D. failing
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