单项选择题

If you keep on, you'll succeed ______.

A．in time
B．at one time
C．at the same time
D．on time
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单项选择题
We ______ this recorder for five hundred yuan.
A．spent
B．cost
C．bought
D．paid
单项选择题
Not only I but also Jane and Mary ______ tired of having one examination after mother.
A．is
B．are
C．am
D．be
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