题目内容：
I have been trying to contact （） you all day.
A.to
B./
C.with
D.on
参考答案：
选择题：I have been trying to contact （） you all day.
- 题目分类：中国大学MOOC慕课
- 题目类型：选择题
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载流导体在磁场中将会受到（）的作用。
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三相不对称负载的中性线断开后，负载最大的一相的相电压将会（）。
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