Exercise is as any other to lose unwanted weight.
A. such useful a way
B. so useful a way
C. as a useful way
D. as useful a way
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A. such useful a way
B. so useful a way
C. as a useful way
(答案→)D. as useful a way
解析：本题考查as…as的用法。在结构as…as中的两个as之间通常接形容词或副词的原级，但若涉及数量或程度，可用“as much+不可数名词+as”和“as many+可数名词复数+as”；如节可数名词单数要用“as+形容词+(a/an+)名词+as”结构。