单项选择题

The head of the company promised to deal with matters of this sort ______ he returned to his office.

A. until
B. while
C. by the time
D. the moment
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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
______ nearly all behavior is learned behavior is a basic assumption (假设) of social scientists.
A. /
B. That
C. It is acceptable
D. When
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