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
搜题请搜索小程序“爱下问搜题”
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：D