题目

Helen is 15 years old, and Joan is 15, too. So Helen is ____ Joan.             A. as big as       B. as older as    C. as old as                D. so old as 答案：C    考查as+形容词原级+as意为“与……一样……”。此处指年龄一样大，用old而                  不用big。肯定句中用as ... as而不能用so ... as。故选C。

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