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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单项选择题
______ time went on, the teacher's words proved true.
A. As
B. While
C. With
D. When
单项选择题
______ I prefer a color TV, I have decided to buy a black and white one this time.
A. Although
B. Because
C. If
D. When
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