单项选择题

It was not until he closed the door ______ he ______ he forgot to take the keys with him.

A．that, realized
B．did, realize
C．which, realized
D．when, realized
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单项选择题
$ 500 ______ far from enough for the girl to complete even one semester at college.
A．are
B．has
C．have
D．is
单项选择题
______ you a president or an ordinary person, you will be punished if you commit a crime.
A．May
B．However
C．Are
D．Be
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