单项选择题

I lost my bag the day before, but it ______ now.

A．has found
B．was found
C．has been found
D．is found
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单项选择题
It is essential that we ______ measures to protect the ozone layer.
A．will take
B．should take
C．would take
D．took
单项选择题
We must study English well, no matter ______ difficult it is.
A．what
B．however
C．how
D．that
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