题目内容

Echo _____ for half a month. She’ll come back in two months.

A. left
B. leave
C. has left
D. has been away

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When I got to the station, then train ______.

A. left
B. had left
C. leave
D. will leave

He said he _______in that factory since 1949.

A. had worked
B. have worked
C. had been worked
D. worked

By the time you get to Beijing, I ______for Shanghai.

A. have left
B. leave
C. shall have left
D. left

以下说法中正确的是【】

A. 沿着电场线移动负电荷,负电荷的电势能是增加的
B. 场强弱的地方电位一定低,电位高的地方场强一定强
C. 等势面上各点的场强大小一定相等
D. 场强处处相同的电场中,各点的电位也处处相同