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
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单项选择题
The population of our city is larger than ______ of theirs.
A．the one
B．this
C．those
D．that
单项选择题
--Is ______. here--No, Bob and Tom have asked for leave.
A．anybody
B．somebody
C．everybody
D．nobody
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