单项选择题

They made ______ of this subject in detail.

A. analysis
B. an analysis
C. an analyses
D. a analyses
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单项选择题
There are many ______ grazing in the field.
A. cows and sheeps
B. cow and sheep
C. cows and sheep
D. cow and sheeps
单项选择题
The theatre can hold ______.
A. a large audience
B. large audiences
C. many audiences
D. much audience
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