问题
选择题
Measures have been taken to solve the problem, but it may be some time________the situation improves.[ ]
A. since
B. when
C. unless
D. before
答案
答案：D
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Measures have been taken to solve the problem, but it may be some time________the situation improves.[ ]
A. since
B. when
C. unless
D. before
答案：D