题目内容

“What was the boy doing?”“He left, then right, then left.”

A. looked
B. is looking
C. was looking
D. will look

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When I was at school, I________to the library every day.

A. go
B. went
C. was going
D. have gone

I first met Lisa three years ago. She________at a book store at the time.

A. had worked
B. worked
C. was working
D. has worked

液压控制阀分类按用途可分为（）。

A. 方向控制阀
B. 压力控制阀
C. 流量控制阀
D. 电动控制阀

液压传动系统中，常用的方向控制阀是（）。

A. 溢流阀
B. 减压阀
C. 顺序阀
D. 单向阀
E. 换向阀