单项选择题

--Are these shoes yours
--No, they are ______ .

A．them
B．their
C．theirs
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单项选择题
He felt ______ when he heard the bad news.
A．happy
B．pleased
C．sad
单项选择题
It's quite early. We ______ worry about the time.
A．mustn't
B．may not
C．needn't
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