题目内容：
—This maths problem is easy ______.
A. work out B. to be working out C. worked D. to work out
参考答案：
答案解析：
选择题：—This maths problem is easy ______.A. work out B. to be working out C. worked D.
- 题目分类： 大学英语B级
- 题目类型：选择题
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1kV及以下电力电绳和控制电缆、可用IkV兆欧缘、绝缘电阻值一般不低于（）MΩ。A．10B．20C．40D．100
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