Jack could have avoided that terrible car accident, but he ________ careful enough.

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• 1—You may find the key to the math problem on page 107. —Ah, it's so simple. I wonder why I _____ of that.

  A.hadn't thought

  B.haven't thought

  C.didn't think

  D.wasn't thinking

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• 2Using a telescope we could see that something ______ .

  A.is happening

  B.happened

  C.would happen

  D.was happening

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• 3There are lots of problems in your hometown, but we're happy to see many of them__________.

  A.are solving

  B.are solved

  C.have solved

  D.are being solved

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• 4Sorry, I am too busy now. If I _____ time, I would certainly go for an outing with you.

  A.have had

  B.had had

  C.have

  D.had

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• 5Nearly half a million immigrants，many of them English—speaking， ______  in the country during the last quarter of the nineteenth century．

  A.have arrived

  B.had arrived

  C.arrived

  D.have been arriving

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• 6Mr. Lee, who _______ as a carpenter for over 10 years, is now a very famous statesman in this country.

  A.has worked

  B.had worked

  C.worked

  D.works

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• 7When Nancy was at college, she ____ three foreign languages, but I am surprised to find that  she ____ all except a few words of each.

  A.spoke; had forgotten

  B.had spoken; had forgotten

  C.spoke; has forgotten

  D.had spoken; has forgotten

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• 8To understand the complex situation completely requires more thought than ________ so far.

  A.gave

  B.has given

  C.has been given

  D.is being given

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• 9I _________the office yesterday afternoon when a stranger came in with a boy．

  A.left

  B.was about to leave

  C.was to have left

  D.will leave

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• 10——Is this the first time you _______ Qingdao? —— No, but the first time I _______ here, the city wasn't so beautiful.

  A.visited; came

  B.visited; have come

  C.have visited; have come

  D.have visited, came

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