单项选择题

You __________ tell anybody about this―it's a secret.

A．can't
B．mustn't
C．needn't
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单项选择题
Tom is the tallest of __________ in the family.
A．all other sons
B．all the brothers
C．all other brothers
单项选择题
That is our classroom, and which is __________
A．there
B．their
C．theirs
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