单项选择题

Don’t get off the bus （） it has stopped.

A. until
B. if
C. when

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We’ll try our best to finish the job in time （） it has been raining these days.

A. as
B. if
C. though
单项选择题
We sent the letter by air （） it might reach them in good time.

A. if
B. so that
C. since
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