单项选择题

No one can be sure if the cars on display fit him or her until he or she ______ them.

A．tries
B．will try
C．are trying
D．have tried
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单项选择题
The manager of the company sent me a fax saying that he would visit us next spring ______.
A．some time
B．sometime
C．sometimes
D．some times
单项选择题
They are ______ students that they all performed well in the nationwide examinations.
A．so diligent
B．such diligent
C．so much diligent
D．such very diligent
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