1 . (2010· 全国卷Ⅱ )Excuse me
I ________ I was blocking your way
A . didn't realize B . don't realizeC . haven't realized D . wasn't realizing解析:考查时态
根据第二句后半部分的内容可知叙述的是过去的情况,此处表示的是说话之前没有意识到挡住了对方的路,所以用一般过去时
答案: A2 . (2010· 重庆高考 )The book has been translated into thirty languages since it ________ on the market in 1973
A . had come B . has comeC . came D . comes解析:考查时态
since 所引导的从句通常用一般过去时
答案: C3 . (2010· 安徽高考 )Bob would have helped us yesterday ,but he ________
A . was busy B . is busyC . had been busy D . will be busy解析:考查时态
would have done 表示本来要做某事,可是实际上并没有做,是对过去事情的虚拟
此处 but说明实际情况
故用一般过去时
答案: A4 . (2009· 四川高考 )—You speak very good French
—Thanks
I ________ French in Sichuan University for four years
A . studied B . studyC . was studying D . had studied解析:句意:“你的法语说得真好