单项选择题

Look ! Some pieces of paper are on the floor. Let's ______.

A．pick it up
B．pick up it
C．pick them up
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单项选择题
The policeman told the boy ______ a kite in the street.
A．not fly
B．don't fly
C．not to fly
单项选择题
You'd better ______ any noise. Mum is sleeping.
A．not make
B．don't make
C．not to make
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