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    【题目】Oil, exported from Iran to Europe, ______ by tankers. ( )

    A.used to be transported/have been built up

    B.used to being transported/have built up

    C.was used to be transported/had been built up

    D.was used to being transported/will be built up

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    【题目】______ careless, or you will make mistakes. ( )

    A.Be notB.Not beC.Don’tD.Don’t be

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    【题目】Elections ______ every four years and Congress meets once a year. ( )

    A.are taken placeB.are to be taken placeC.took placeD.take place

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    【题目】We have sometimes accidents on this line, but no accidents ______ since last winter. ( )

    A.occurB.have occurredC.have been occurringD.are occurring

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    【题目】I ______ swimming in the river and I always ______ to swim when I can. ( )

    A.am liking/ have goneB.am being liked/ am going

    C.like/ goD.have liked/ have been going

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    【题目】I ______ the incident as if it were yesterday. ( )

    A.am still to rememberB.have still been remembering

    C.am being still rememberedD.still remember

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    【题目】This is the first time the students ______ to Hyde Park. ( )

    A.have goneB.have been goneC.have been goingD.are being gone

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    【题目】My uncle, Sam, ______ manager of the firm. ( )

    A.has just madeB.is just being madeC.has just been madeD.is just made

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    【题目】Chinese married couple ______ red packets to children and the unmarried during the Chinese New Year. ( )

    A.giveB.have been givingC.are givingD.have given

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    【题目】“______ your best? It’s not satisfactory. I’m afraid you will have to do it again.” ( )

    A.Do you tryB.Have you triedC.Are you tryingD.Have you been trying

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