---How your brother?-Fine.A. amB. isC. beD. are

问题补充：

---How your brother?

---Fine.

A. am

B. is

C. be

D. are

答案：

A. am

(答案→)B. is

C. be

D. are

解析：考察be动词。 your brother 单数故排除CD，又因为am只能在I 后面所以选is，故选B