According to the report, this virus was never known, which had claimed countless

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According to the report, this virus was never known, which had claimed countless lives, _____ it was
accidentally found by a doctor. [ ]
A. unless
B. since
C. so that
D. until

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举一反三

Whitney Houston’s sudden death suggests that drug abuse is such a serious problem ______ we should
deal with properly. [ ]
A. as
B. that
C. which
D. where

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______ our national football team lost the game to a weak team, I held no doubt about the new coach’s
ability. [ ]
A. Until
B. By the time
C. Unless
D. After

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Some economists predict that the dollar will remain weak _______ economies abroad are expected to
grow faster than that of the United States. [ ]
A. while
B. as
C. before
D. until

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We know it is hard to make such a decision _______ he has just built up the team and the project is going through the important stage now. [ ]
A. that
B. as
C. when
D. before

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Many people can"t learn any lessons from the mistakes they"ve made _____ they get hurt somehow. [ ]
A. whether
B. unless
C. if
D. as

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