单项选择题

Michael studied hard before the examination in mathematics, and it ______ . He made an

A． paid out
B．paid off
C．paid over
D．paid well
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单项选择题
The sun warms the earth, ______ makes it possible for plants to grow.
A．this
B．that
C．as
D．which
单项选择题
I spent two weeks in Paris last year. ______ there before
A．Did you go
B．Have you gone
C．Have you been
D．Had you gone
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