题目

—Your English is good.—Thank you. I      it for three years.A. learn                         B. learnC. have learned                   D. had learned 答案：C16．在平面直角坐标系中，点M（-4，3）所在的象限是（　　）A．第一象限B．第二象限C．第三象限D．第四象限