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

 

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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

 

查看答案和解析>>


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