单项选择题

______ your number, I would have telephoned you.

A．Had I
B．If I have
C．I had
D．I have
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______ is known to all, China is a developing country.
A．What
B．As
C．which
D．That
单项选择题
It's high ______ you stopped smoking all those cigarettes.
A．sense
B．time
C．opportunity
D．reason
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