单项选择题

I have been to the West Lake three times ______ 1970.

A．since
B．until
C．from
D．after
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单项选择题
You ______ me because I didn’t say that.
A．must understand
B．must be understanding
C．must have understood
D．had to misunderstand
单项选择题
Asia is ______ among the seven continents.
A．largest
B．the largest
C．larger
D．the larger
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