试题题干
Fill in the blanks with the words given in brackets. Make changes or add something where necessary.
The workers 
(build) the bridge this time last year.
参考答案
试题解析
this time last year是过去进行时的标志词，且workers为复数形式，故用 were building。
句意：工人们去年这个时候正在建这座桥。