单项选择题


A．therefore
B．however
C．though
D．thereby
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单项选择题
A(n) ______ disease is one that can be passed from one person to another.
A．influential
B．infectious
C．immune
D．popular
单项选择题
The ______ personality in our firm was John Brown.
A．dominant
B．dominate
C．dormant
D．donate
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