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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单项选择题

In this experiment, they are wakened several times during the night, and asked to report what they ______.

A．had just been dreaming
B．have just been dreaming
C．are just dreaming
D．had just dreamt

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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