单项选择题

It was not until she arrived at the airport ________she realized she had forgotten her passport.

A．and
B．when
C．where
D．that
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单项选择题
The professor, ________whether anyone would come to help him, had to prepare for the experiment by himself.
A．did not know
B．having not known
C．had not known
D．not knowing
单项选择题
I was surprised that no one ________them of the danger.
A．warns
B．warned
C．has warned
D．had warned
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