单项选择题

The scientists have made an ______study of the viruses that cause the disease.

A．exhausted
B．exhausting
C．exhaustive
D．exhaustion
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单项选择题
Do you own your apartment or are you a______
A．tenant
B．customer
C．client
D．proprietor
单项选择题
It was strange that she would ______such an absurd idea.
A．allow
B．stick
C．take
D．entertain
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