单项选择题

You ______ a tip if you're not satisfied with the service.

A．mustn't leave
B．must leave
C．can leave
D．don't have to leave
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单项选择题
I'm at my wits' end. Tell me to do.
A．how
B．what
C．when
D．why
单项选择题
In the legal profession, men ______ women by five to one.
A．supersede
B．outnumber
C．outclass
D．overcome
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