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______ this approach is effective in los...

______ this approach is effective in losing weight, it is not as beneficial as keeping a balanced diet.

A.Once B.While C.Unless D.Until

 

B 【解析】 考查状语从句连词。句意:虽然这种方法在减肥方面很有效,但是它不如保持均衡的饮食更有益。A. Once一旦;B. While虽然;C. Unless除非;D. Until直到。根据句意和句子结构可知,此处用while“虽然”,引导让步状语从句,符合语境和语法,故选B项。  
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