Many people believe we are heading for environmental disaster _____we radically(彻底地) change the way ...
2023-02-04 22:09:58 70次 20102011年河南省高二下期末考试英语试题 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
Many people believe we are
heading for environmental disaster _____we radically(彻底地) change the way we
live.
A.
but
B. although C.
unless D. until
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