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
The football match was ______ because of the heavy rain.
A. called over
B. called up
C. called out
D. called off
单项选择题
Do you own your apartment or are you a ______
A. tenant
B. customer
C. client
D. proprietor
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