精选优质文档-倾情为你奉上小学英语时态练习题及答案【三篇】 1. How can I ever concentrate (集中精力) if you _ continually _ me with silly questions? A. haveinterrupted B. had interrupted C. areinterrupting D. wereinterrupting 2. I bought this shirt for 35 yuan yesterday. Its on sale today for only 29. You should have waited. Oh, really? But how _ I know? A. would B. can C. did D. do 3. Will you go now? Not until I _ my experiments. A