单项选择题

It was not until he arrived at the station ______ he realized he had forgotten his ticket.

A) when
B) that
C) for
D) in
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单项选择题
Do yon remember______ Professor Fan during your last visit
A) introducing
B) being introduced to
C) to have introduced to
D) to be introduced to
单项选择题
We agreed to accept （） they thought was the best tourist guide.

A.whatever
B.whomever
C.whichever
D.whoever
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