So far a series of problems ________ brought about by this decision．

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• 1You _______ late for yesterday's class meeting, as it was so important.

  A.couldn't

  B.shouldn't be

  C.mustn't have been

  D.oughtn't to have been

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• 2When you phoned me,I was having a meeting,otherwise I_______your call.

  A.answered

  B.would answer

  C.had answered

  D.would have answered

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• 3Perce Blackborow and his companions stayed on Elephant Island for six months before rescue came, so they ________ a lot of difficulties.

  A.must go through

  B.may go through

  C.must have gone through

  D.could have gone through

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• 4It ________ be difficult to discover the truth about Iraq War if people refused to consider anything that might be true．

  A.would

  B.can

  C.need

  D.should

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• 5Flight 3010______,I must be off now or I'll be late.

  A.to announce

  B.is announced

  C.is being announced

  D.announced

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• 6With most of the trees he had planted ________ in the hurricane, John felt very disappointed and upset．

  A.to be destroyed

  B.were destroyed

  C.would be destroyed

  D.destroyed

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• 7Two-thirds of the members in the club ________ the wealthy class．

  A.belong to

  B.are belonged to

  C.are belonging to

  D.belonging to

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• 8After the heated discussion, a conclusion ________ about the matte．

  A.put forward

  B.was appeared

  C.was reached

  D.was arrived at

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• 9“I don't understand why you _________ your mind!”I said angrily to him．

  A.constantly change

  B.will constantly change

  C.are constantly changing

  D.have constantly changed

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• 10The officials from the United Nations ________ the fact that Iran isn't involved in uranium enrichment(铀浓缩)．

  A.hardly convince

  B.are hardly convinced

  C.hardly convince of

  D.are hardly convinced of

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