单项选择题

Ellis and her sisters could hardly recognize the value of that family heirloom, ______

A．couldn't they
B．couldn't she
C．could they
D．could she
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单项选择题
The chief reason for the population growth isn't so much a rise in birth rates a fall in death rates as a result of improvements in medical care.
A．but
B．or
C．as
D．and
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
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