问题
选择题
The temperature of our earth will become higher and higher _____ we take actions right now. [ ]
A. unless
B. if
C. as soon as
D. as
答案
答案：A
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The temperature of our earth will become higher and higher _____ we take actions right now. [ ]
A. unless
B. if
C. as soon as
D. as
答案：A