单项选择题

He doesn't seem to be able to ______ any interest in his studies.

A．make up
B．work up
C．turn up
D．use up
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单项选择题
Dr. Smith failed many times but he finally ______ to find a successful way to solve the problem.
A．broke off
B．broke down
C．broke out
D．broke through
单项选择题
The precious manuscripts were hopelessly ______ by long exposure in the cold, damp cellar.
A．ruined
B．damaged
C．destroyed
D．harmed
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