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The market report indicates there is _______ market in South America for about 40 tons a year.
A、big
B、no
C、a
D、the
【正确答案】：C
【题目解析】：动词be后所接的名词是单数可数名词，因此选C。句意：根据市场报告，南美洲每年约有40吨的需求量。