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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