After Jack had sent some e-mails, he _______ working on his project.

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• 1— Hello, I ____ you ____ in London, how long have you been here?  — I came here last week.

  A.don't know; were

  B.didn't know; were

  C.haven't known; are

  D.hadn't known; are

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• 2So addicted to computers ____ that the leaders in the summer camps often had to force them to break for sports.

  A.the children did become

  B.did the children become

  C.the children became

  D.became the children

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• 3— I telephoned him twice and I couldn't get through to him. — I think that the line might have been out of order, ____  ?  

  A.don't you

  B.wasn't it

  C.do you

  D.hadn't it

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• 4— When do you think _____ he_____ the dictionary?— Sorry. I have no ide

  A.A.had; bought

  B.has; bought

  C./; bought

  D.did; buy

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• 5Only when I left my hometown ________ how precious it is to me.

  A.did I realize

  B.I realized

  C.had I realized

  D.I had realized

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• 6Scientists have many theories about how the universe ____ into being.    

  A.came

  B.was coming

  C.had come

  D.would come

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• 7— You seem to be familiar with this city!— I _______ English in a high school here for three years. It' s great to be back!

  A.have taught

  B.have been teaching

  C.had taught

  D.taught

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• 8The other day I ________ an interesting film with my friends.

  A.saw

  B.hadseen

  C.see

  D.amseeing

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• 9— I can't find my cell phone in my bag.—     it at home.

  A.Have you left

  B.Did you leave

  C.Had you left

  D.Do you leave

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• 10Not until his father died ____ what his father really meant.

  A.do they realize

  B.did they realize

  C.realized they

  D.had they realized

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