题目内容
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 |
试题答案
CExperts 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 |
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
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