题目内容

在密立根油滴实验前,需要对实验装置进行水平调节。

A. 对
B. 错

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() they ()chess in the classroom yesterday?

A. Did, played
B. Do, play
C. Did, play
Do , played

I () the jacket two days ago.

A. buy
B. buys
C. bought
D. is buying

Who () the plates on the table?

A. break
B. breaks
C. broke
D. broken

Betty never () to school late when she was in middle school.

A. come
B. came
C. comes
D. is coming

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