单项选择题

He kept silent, so I couldn`t know _____ he agreed _____ not.

A．if; or
B．whether;
C．either; or
D．neither; nor
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单项选择题
What is the reason for _____ on time
A．not your coming
B．you not come
C．your not coming
D．you not to come
单项选择题
The police are _____ for the thief in the region now.
A．running
B．reaching
C．searching
D．charging
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