I saw him in the library yesterday. He a book at that moment.A. readsB. is readingC. was

问题补充：

I saw him in the library yesterday. He a book at that moment.

A. reads

B. is reading

C. was reading

D. will read

答案：

A. reads

B. is reading

(答案→)C. was reading

D. will read

解析：句意：昨天我在图书馆看见他了。那时他正在读一本书。结合语境可知下文描述的是过去某时正在进行的动作，故用过去进行时态。选Ｃ。