单项选择题

There used to be a cherry tree in this field,_________

A．usedn't it
B．usen't it
C．didn't it there
D．usedn't there
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单项选择题
He _________a good knowledge of English by careful study.
A．gained
B．obtained
C．earned
D．acquired
单项选择题
_________the desert is like a sea,_________ is the camel like a ship.
A．What, as
B．As, so
C．As, as
D．That, so
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