Helen is 15 years old, and Joan is 15, too. So Helen is Joan. A. as big asB. as older as

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

A. as big asB. as older as(答案→)C. as old asD. so old as解析：句意：海伦15岁，琼也15岁，所以海伦和琼一样大。As+形容词原级+as表示“和……一样……”, as old as （年龄）一样大。Big用来形容体积大小，结合题意故选C。

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