单项选择题

The most important thing to do ______ the pollution as soon as possible.

A．are got rid of
B．is to get rid of
C．is get rid of
D．is for us getting rid of
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单项选择题
I couldn't understand why he pretended ______ in the bookstore.
A．to see me not
B．not to see me
C．not see me
D．to see not me
单项选择题
Such ______ the case, there are no grounds to justify your complaints.
A．is
B．was
C．is being
D．being
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