They were surprised that a child should work out the problem ________ they themselves couldn't.

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• 1It has been many years since I was last in London_______ I still remember something that happened during that visit.

  A.and

  B.for

  C.but

  D.as

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• 2This year's fall in profits was not unexpected _______ ,it is very disappointing.

  A.Otherwise

  B.But

  C.However

  D.Nevertheless

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• 3It will take us another five years______the construction of all the 121 roads is completed.

  A.when

  B.since

  C.before

  D.After

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• 4I'm thinking about going to Germany this summer and I need your advice. You're the best person I know to answer my questions, _______  you're German.

  A.after

  B.before

  C.for

  D.unless

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• 5_______ well prepared you are, you still need a lot of luck in mountain climbing.

  A.However

  B.Whatever

  C.No matter

  D.Although

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• 6____ we can't remove our troubles in life for ever,we can leave them behind when we are on vacation.

  A.When

  B.While

  C.Unless

  D.Until

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