—?—She is twenty.A. What’s your grandmother’s ageB. How old is your brotherC. How old is

问题补充：

—?

—She is twenty.

A. What’s your grandmother’s age

B. How old is your brother

C. How old is your sister

D. When is your sister’s birthday

答案：

A. What’s your grandmother’s age

B. How old is your brother

(答案→)C. How old is your sister

D. When is your sister’s birthday

解析：回答语的含义是她20岁，人称是女的，问年龄可用how old，your sister指女的，故本题选C。

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