_____ these experiments were successfully completed would we think of going into humans.

试卷相关题目

• 1The Great Wall is ______ tourist attraction that millions of people pour in every year.

  A.so a well-known

  B.a so well-known

  C.such well-known a

  D.such a well-known

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• 2He said it would be at least three more months ________ he could recover and return to school.

  A.when

  B.before

  C.since

  D.after

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• 3_______ he has made a decision, it is not easy for you to make him change his mind.

  A.Though

  B.Unless

  C.Once

  D.Until

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• 4________we went to visit Professor Smith, he________his research work.

  A.The first time; devoted to

  B.Whenever; was concentrate on

  C.For the first time; was busy with

  D.Each time; was absorbed in

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• 5_______ the whole society care for children as well as their parents, children can grow healthily and happily.

  A.As soon as

  B.Once　　　

  C.The moment　　

  D.So long as

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• 6--- Can you tell me how to improve my English? --- Do more speaking, I think , ________you will be good at spoken English.

  A.or

  B.for

  C.and

  D.until

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• 7We didn't know you were in trouble at that time, _______ we would have given you a hand.

  A.therefore

  B.unless

  C.otherwise

  D.so

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• 8--What are you going to do this weekend？ --I will go to visit my grandparents _____ I have time.

  A.as far as

  B.as much as

  C.as long as

  D.as many as

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• 9None of the underwater workers has been harmed by the great fish. ________, most fish were so friendly that they played with the instruments.

  A.Instead

  B.Even though

  C.However

  D.Though

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• 10My brother has his own business — that's also ______ I expect to do after I graduate from Harvard University.

  A.why

  B.when

  C.that

  D.what

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