单项选择题

It was nine o'clock ______ I arrived at the airport.

A．that
B．before
C．when
D．since
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单项选择题
The main 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．and
B．but
C．or
D．as
单项选择题
She took an umbrella with her this morning ______ she should be caught in the rain.
A．so that
B．in order that
C．in case
D．now that
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