单项选择题

______ time went on, the teacher's words proved true.

A. As
B. While
C. With
D. When
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______ 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
单项选择题
______ there are only 20 minutes left before the train left, I felt uneasy in the taxi to the railway station.
A. That
B. When
C. Which
D. Because
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