单项选择题

Ask for a doctor as quickly as possible and tell him it's a ______ of life and death.

A．thing
B．matter
C．question
D．problem
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单项选择题
They tried to prevent the marriage but it took place ______.
A．notwithstanding
B．thereafter
C．inasmuch
D．henceforth
单项选择题
Brushing your teeth regularly helps to ward ______ tooth decay.
A．down
B．against
C．off
D．away
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