题目

. I forgot ________ my exercise-book with me, so I can’t lend it to you now. A. to bring     B. bringing      C. to have       D. having brought 答案：A有关合金的叙述错误的是  (　　)。A．铁与非金属氯、氧等很难形成合金B．合金是混合物C．合金具有固定的熔点D．形成合金后，其熔点要提高