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
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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
单项选择题
The work is not very profitable cash, but I am getting valuable experience from it.
A．in the light of
B．according to
C．on the basis of
D．in terms of
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