单项选择题

The roof fell（）he had time to dash into the room to save his baby.

A. since
B. as
C. before
D. until

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单项选择题
（）the room temperature, she kept the heater on.

A. Kept on
B. Keeping up
C. So as to keep up
D. To keep up
单项选择题
We never dared to ask him a question（）

A. did we
B. didn’t we
C. dared we
D. daredn’t we
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