There is no way of knowing why one man makes an important discovery ______ another man, also intelligent, fails.

试卷相关题目

• 1It is hard for the Greek government to get over the present difficulties_____ gets more financial support from the European Union.

  A.if

  B.unless

  C.because

  D.since

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• 2_________ we have been classmates for three years, she hasn't left me much impression, so I can't remember her after graduation.

  A.Since

  B.Although

  C.Because

  D.Unless

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• 3Sinking in the cheers of people, David walked off the stage, tears dropping _______ he could stop them．

  A.after

  B.when

  C.until

  D.before

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• 4Sarah hopes to become a friend of _______ shares her interests.

  A.whoever

  B.whomever

  C.anyone

  D.whom

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• 5________he visited, he wasted no time hearing farmers' voices at home and in the fields.

  A.Each time

  B.In case

  C.Even if

  D.In time

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• 6The fact _______ Lucy has been admitted into Lanzhou university made us excited.

  A.what

  B.that

  C.which

  D./

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• 7 —How did you pass the challenging test? —It was a long time________I found a series of suitable methods.

  A.when　

  B.until

  C.since　

  D.before

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• 8Helen has just heard the news from her father ________ her boyfriend David will come back soon.

  A.when

  B.how

  C.which

  D.that

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• 9We students are so busy with our homework that we have no time for outdoor exercise, ______ we have the desire.

  A.wherever

  B.whenever

  C.even if

  D.as if

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• 10Europeans always hold their fork in the left hand, ________Americans switch it between their left and right hands.

  A.before

  B.because

  C.while

  D.since

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