单项选择题

After ______ seemed an endless wait, it was her turn to step into the doctor's office.

A．it
B．that
C．what
D．which
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单项选择题
The thieves ______ the possibility of the alarm system sounding
A．overtook
B．overcame
C．overlooked
D．overworked
单项选择题
To survive in the intense market competition, we must ______ the qualities and varieties of products we make to the world-market demand.
A．improve
B．guarantee
C．gear
D．enhance
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