单项选择题

All their attempts to ______ the child from the burning building were in vain.

A．regain
B．recover
C．rescue
D．reserve
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单项选择题
Mrs. Lackey was awakened by the ringing of the bedside phone and learned that 12 hours ago her husband's boat had been ______.
A．wrecked
B．collapsed
C．decayed
D．fired
单项选择题
78（）

A．refers
B．applies
C．happens
D．concerns
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