题目内容

He used to __(swim)when he was young.

A. swim
B. swimming
C. swam
D. swum

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He told me that he had __(be ) to the USA three times before.

A. being
B. was
C. to be
D. been

After he had finished all his work.he__(go ) home.

A. goes
B. went
C. to go
D. going

简述液力传动油的使用性能?

我国液力传动油（自动变速器油）的品种有哪些？各自的使用范围是什么？