在接地体径向地面上，水平距离为（）m的两点间的电压，称为跨步电压。
A.1.6
B.1.2
C.1.0
D.0.8
参考答案：D
Tom ________ in the library every night over the last three months.[ ]
A. works
B. worked
C. has been working
D. had been working
国际旅游
