my brother is not at home .he---to the library

A。has gone根据前一句,本句应该用现在时态,has gone to 表示去了,反正现在不在此地；正确 B。has been虽然时态对了,但has been to是去过,人现在回来了,就在此地,故错误；C。had been和D。had gone都用了过去时态,与现在无关,故错误。