单项选择题

In some countries traveling on public transport is a tremendous ______.

A．charge
B．amount
C．expense
D．sum
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It's high ______ you stopped smoking all those cigarettes.
A．sense
B．time
C．opportunity
D．reason
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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