过去进行时 was / were being done A meeting was being held when I got there. 现在完成时 have / has been done -The window is dirty.

-I know. It hasn't been cleaned for weeks. 过去完成时 had been done By the end of last year, another new gymnasium had been completed in Beijing. 将来完成时 will have been done All the construction work will have been completed by the end of 2008s

学以致用

从A、B、C、D四个选项中，选出可以填入空白处的最佳选项。

1. A new cinema ______ here. They hope to finish it next month.

A. will be built B. is built C. has been built D. is being built

2. -Why did you leave that position?

-I ______ a better position at IBM.