---Is that your friend?.A. Yes it’sB. Yes it isn’tC. Yes it isD. Yes he is

问题补充：

---Is that your friend?

--- .

A. Yes, it’s

B. Yes, it isn’t

C. Yes, it is

D. Yes, he is

答案：

A. Yes, it’s

B. Yes, it isn’t

(答案→)C. Yes, it is

D. Yes, he is

解析：英语一般疑问句的回答一般遵循三个一致原则，即人称一致，单复数一致，时态一致。根据问句的人称和时态可知选C。