单项选择题

Only after I had reached the airport ______ that I had forgotten to take my ticket with me.

A) I realized
B) have I realized
C) did I realize
D) I had realized
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单项选择题
Peter ______ come with us tonight, but he is not very sure yet.
A) must
B) can
C) may
D) will
单项选择题
In order to search for the escaped prisoner, the policeman decided to question ______ comes along this road.
A) who
B) whom
C) whoever
D) whomever
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