单项选择题

Postal ______ are determined by the class and weight of the parcel mailed.

A．taxes
B．payment
C．fees
D．premium
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单项选择题
It is only when you overcome all difficulties and reach your goal ______ fully aware that the way to success is not paved with flowers.
A．do you become
B．then you become
C．that you become
D．have you become
单项选择题
With his poor English, he even cannot get his ideas across, ______ exert any essential effect on others.
A．let alone
B．that's to say
C．not to speak
D．not to say
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