题目

In Lebanon, they say, a 50% increase in the price of cigarettes would lead to ________ many people ________ smoking in poorer households as wealthy families. A . as twice; quitting B . twice as; to quit C . as twice; to quit D . twice as; quitting 答案：D已知代数式的值x2+3x+5的值为7，则代数式3x2+9x﹣1的值为 ．