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
He can hardly understand what the teacher has said,______.
A．nor shall I
B．neither can I
C．so do I
D．so I can
单项选择题
Recently he______ every night until after one o' clock, preparing for the final exam.
A．shows up
B．show off
C．stays in
D．stays up
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