Exercise is as any other to lose unwanted weight.
A. so useful a way
B. as a useful way
C. as useful a way
D. such useful way
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A. so useful a way
B. as a useful way
(答案→)C. as useful a way
D. such useful way
解析：本题考查as…as比较结构,另： as，so，too，how +adj.+a+单数可数名词。