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Measureshavebeentakentocleanupthelake,butitwillbesometimethesituationimproves.[]A.althoughB.beforeC.unlessD.when

题目详情
Measures have been taken to clean up the lake,but it will be some time________the situation improves.
[     ]
A. although  
B. before  
C. unless  
D. when
▼优质解答
答案和解析
B