单项选择题

______ has been mentioned above, the size of a canal depends upon the kind of boats going through it.

A．What
B．This
C．As
D．It
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单项选择题
All flights ______ because of the terribly bad weather, the passengers had to wait at the airport.
A．had been cancelled
B．having cancelled
C．having been cancelled
D．were cancelled
单项选择题
Soon after the drug ______ effect, the patient became quieter.
A．brought
B．made
C．took
D．released
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