单项选择题

It is said that his father _______ for several years.

A．had died
B．has been dead
C．died
D．has dead
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单项选择题
Women are often said to be more _______ than men.
A．liable
B．identical
C．emotional
D．immense
单项选择题
The protection device can eliminate the faults _______ they cause more damage.
A．unless
B．until
C．before
D．although
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