Although schistosomiasis is not often fatal, it is so debilitating that it has become an economic drain on many developing countries.
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Ait is so debilitating that it has become an economic
分析该选项
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Bit is of such debilitation, it has become an economical
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Cso debilitating is it as to become an economic
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Dsuch is its debilitation, it becomes an economical
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Ethere is so much debilitation that it has become an economical
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正确答案: A