问题
选择题
Experts are trying to work out a plan to deal with the problems caused by global warming________
it is too late.[ ]
A. when
B. if
C. before
D. until
答案
答案：C
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Experts are trying to work out a plan to deal with the problems caused by global warming________
it is too late.[ ]
A. when
B. if
C. before
D. until
答案：C