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
The old woman kept one black dog and two white ______.
A． one
B． ones
C． those
单项选择题
Dick is ______ years old.
A． one
B． two
C． three
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