单项选择题

Since you are free, why ______ it now

A．don't
B．doesn't
C．do not
D．not do
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单项选择题
As an organizer of the concert, he had been obliged to ______ himself more than ever, to evade the enormous number of applications for the tickets of admission to the concert.
A．conclude
B．exclude
C．include
D．seclude
单项选择题
The employees were all very exhausted, but ______ of them would stop to take a break.
A．neither
B．none
C．nor
D．no
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