单项选择题

The scientists have absolute freedom as to what research they think it best to______.

A．engage
B．devote
C．seek
D．pursue
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单项选择题
This disease ______itself in yellowness of the skin and eyes.
A．manifests
B．modifies
C．magnifies
D．exposes
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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