题目

English _____________ in more and more countries today.A teaches      B teach        C  was taught      D is taught 答案：D解析:略 若a＝b＋c，则3(a＋2b)－2(c＋3b)－2(a＋b)的值为 [　　] A． a B． －a C． b D． －b