单项选择题

It's very informal here, you ______ wear a tie unless you want to.

A．don't have to
B．must not
C．could not
D．may not
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单项选择题
It is important for everyone ______ learn English.
A．by
B．when
C．to
D．how
单项选择题
He speaks ______ English and German.
A．any
B．either
C．neither
D．both
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