单项选择题

John was late for the business meeting because his flight had been ______ by a heavy storm.

A．kept
B．stopped
C．slowed
D．delayed
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单项选择题
Only ______ according to the directions can the medicine be quite effective.
A．taking
B．taken
C．being taken
D．having been taken
单项选择题
The final examination is coming up soon. It's time for us to ______ our studies.
A．get down to
B．get out
C．get back for
D．get over
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