问题
选择题
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
答案
答案：B
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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
答案：B