单项选择题
69()
A.one
B.another
C.other
D.others
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单项选择题
74()
A.about
B.up
C.forward
D.forth
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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
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