Question

Yesterday evening I ________ a book on science．I'll try to finish it today．

1. A.
   read
2. B.
   have read
3. C.
   had read
4. D.
   was reading

Answer 1

D
过去进行时表示过去某时刻或某段时间正在进行的动作或情况，叙述一个未完成的过程；而一般过去时只表示发生了的动作或情况，答案为D.试比较：
They were building a bridge there．
他们在那里修一座桥.(不一定建成)
They built a bridge there．
他们在那儿修了一座桥.(已建成)
We were making preparations for the conference．
我们正在做会议的准备工作.
We made all the preparations for the conference．
我们花了一周时间做好一切准备.