单项选择题

kook! 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
He was born ______ July 23,1971.
A．in
B．on
C．at
单项选择题
I think English is ______ maths
A．very difficult than
B．so difficult as
C．much more difficult than
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