单项选择题

Bill couldn't understand what the boy was saying because ______.

A．he didn't know much about children
B．the boy was crying and making noises
C．the boy was too afraid to speak clearly
D．the boy wasn't Sam
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单项选择题
--Who's in the classroom--______.
A．No one
B．None
C．Not one
D．Not many ones
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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