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The temperature of our earth will become higher and higher--

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The temperature of our earth will become higher and higher------we take actions right now.
A unless Bif C as soon as Das unless?
The temperature of our earth will become higher and higher--
应选A.
【解析】A.unless是除非的意思,表示如果我们不行动温度就会升高,正确.
B.if表如果,表示如果我们行动了,温度会升高,与客观事实不符,错误.
C.as soon as表示在……时,同样与客观事实不符.
D.没有这种用法.
故选择A.
希望能够帮上楼主的忙~