A good friend should be kind and helpful.___ is my mother.

问题描述:

A good friend should be kind and helpful.___ is my mother.
A such a friend
B one such friend
As i pulled the sheet out of the typewriter,it ___
A tears B is torn C tore D is tearing
但是答案分别是B和C,百思不得其解。

B
B
我都是大学生了,应该是答案错了