单项选择题

Perhaps the day will come ______ our city will be without any pollution..

A．when
B．while
C．as
D．what
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单项选择题
The man burst into the office and tried to grab the money as it ______.
A．was counted
B．has been counted
C．was being counted
D．had been counted
单项选择题
It looks______ the weather is improving.
A．that
B．as if
C．what
D．whether
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