单项选择题

No sooner had he entered Harvard ______ his sister entered Yale.

A．since
B．after
C．than
D．before
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单项选择题
Please don't ______ to ask me if you have any questions. Thank you very' much. I'll do that.
A．pause
B．stop
C．wait
D．hesitate
单项选择题
______ does the No. 3 bus run Every ten minutes.
A．How soon
B．How fast
C．How often
D．How long
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