单项选择题

Please note that I will be away from Boston next week, ______ you want to call me and discuss things.

A．in case
B．unless
C．until
D．so that
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单项选择题
I tried to get out of the business ______ I found impossible to carry on.
A．why
B．which
C．what
D．where
单项选择题
My brother brought me a few reference books, but ______ of them was of any use for my report.
A．neither
B．none
C．either
D．all
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