单项选择题

Dr. Jones checked the patient's ______ carefully before making his treatment.

A．symbols
B．symptoms
C．signs
D．conditions
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单项选择题
So confused ______ that he didn't know how to start his lecture.
A．since he became
B．would he become
C．that he became
D．did he become
单项选择题
The heavily-populated area was a breeding place for ______ diseases.
A．infectious
B．powerful
C．influential
D．suspicious
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