1.A good friend should be kind and helpful.__ is my mother.A.such a friend B.such one friend C.no such friend D.one such friend2.As i pulled the sheet out of the typewriter,it __. A.tears B.is torn C.tore D.is tearing第一题选A第二题选C,我选的是D和B,麻烦解释一下,谢谢