A) must have lasted 　B) will have lasted

　　C) would last 　D) has lasted

　　(10) 现在完成进行时(have been doing)

　　表示某一动作开始于过去某一时间，延续或重复地出现至今，或将继续延续至将来。

　　We _____________( work) on this project for over a month now.

　　注意事项：与现在完成时相比，现在完成进行时更强调：在从过去到现在的时间里，动作或状态一直持续或一直反复出现。It seems oil __ from this pipe for some time. We'll have to take the machine apart to put it right.

　　A) had leaked 　 B) is leaking

　　C) leaked 　D) has been leaking

　　(11)过去完成进行时：had been doing

　　The old clock _______________(take) apart of and fixed up again for several times by my 10-year old son before I came back home.

　　(12)：shall have been doing ，will have been doing

　　By the end of next month, the project __________________________(work) for 3 years.

　　I said on Thursday I _______(see) my friend the next day.

　　(14) 过去将来进行时：should be doing , would be doing

　　The government promised that a new highway __________________( build) next July.

　　(15) ：should have done , would have done

　　I believed by the end of that year an advanced version of that software would have been developed, but I __(be)wrong.

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