题目

In Xi's report, investors are thrilled to see China's promising blueprints, without which they assume their business _______ unstable. A . were B . had been C . would be D . would have been 答案：C8．下列系统命名法正确的是（　　）A．2-甲基-4-乙基戊烷B．3，4，4-三甲基己烷C．2，3-二乙基-1-戊烯D．3，4-二甲基-4-乙基己烷