单项选择题

______ second thoughts I'm quite content to stay for the time being.

A．At
B．On
C．In
D．As
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单项选择题
--You don't seem to be quite yourself today. What's wrong--Oh, I'm suffering from a cold. Nothing serious,______.
A．yet
B．indeed
C．though
D．anyway
单项选择题
At the ______ of the bell, the students rushed into the classroom.
A．sight
B．noise
C．voice
D．sound
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