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
Your explanation doesn't hold ______ .
A．honey
B．liquid
C．reason
D．water
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