单项选择题

It is not easy to learn English well, but if you ______, you will succeed in the end.

A．hang up
B．hang about
C．hang on
D．hang onto
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单项选择题
Cancer is second only ______ heart disease as a cause of death.
A．of
B．to
C．with
D．from
单项选择题
It ______ months since we ______ in Shanghai.
A．has been; were
B．is; are
C．was; had been
D．had been; have been
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