单项选择题

--Who's in the classroom--______.

A．No one
B．None
C．Not one
D．Not many ones
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单项选择题
--Who is knocking at the door--______.
A．It's me
B．I am
C．this is I
D．Its me
单项选择题
The population of our city is larger than ______ of theirs.
A．the one
B．this
C．those
D．that
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