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