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
You cannot but ______ hard and stick to your goals if you really want to succeed.
A．work
B．to work
C．working
D．to be working
单项选择题
A．withB．inC．onD．for
A．with
B．in
C．on
D．for
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