Usually scientists test a theory for a while they accept it as true. A. before B. unless ——青夏教育精英家教网——

摘要： Usually scientists test a theory for a while they accept it as true. A. before B. unless C. until D. thought

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Usually scientists test a theory for a while______they accept it as true.

A.　　 before　　　　　　　　　　　　　　

B.　　 unless

C.　　 until　　　　　　　　　　　　　　

D.　　 though

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Usually scientists test a theory for a while______they accept it as true.

A.　　 before　　　　　　　　　　　　　　

B.　　 unless

C.　　 until　　　　　　　　　　　　　　

D.　　 though

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