单项选择题

You ______ talk so loud in the library.

A． needn't
B． may not
C． mustn't
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单项选择题
--It's a bird. --I don't know ______ name.
A． it
B． his
C． its
单项选择题
Can we call him Jim ______ short
A． at
B． for
C． of
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