单项选择题

— Is Mr. Li here
— No. But he

A．is
B．was
C．is not
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单项选择题
— Have you ever been to______ United States— No, but I have been to______ England.
A．the, the
B．/,/
C．the,/
单项选择题
You can work out the problem ______ .
A．happy
B．easily
C．easy
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