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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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
单项选择题
It is important that hotel receptionist that guests are registered correctly.
A．has made sure
B．make sure
C．makes sure
D．made sure
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