单项选择题

Just let it go ______ you don't want to be involved in any argument.

A．if
B．unless
C．until
D．whether
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单项选择题
None of you ______ to stay until the game is over, if you don't want to.
A．must
B．needn't
C．has
D．haven't
单项选择题
John isn't here. He's on assignment in New York. So the person you spoke to this morning ______ have been John.
A．must
B．might
C．might not
D．can't
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