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:Scientist have reached the conclusion_____the temperature o

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:Scientist have reached the conclusion_____the temperature on the earth is getting higher and higher.
A.when B.but C.that D.for that
我认为是AD
为什么不是:科学家研究得出了地球上的温度什么时候开始慢慢升高的结论。
that前不可以加介词 why?
:Scientist have reached the conclusion_____the temperature o
C
定语从句
that the temperature on the earth is getting higher and higher.用来修饰the conclusion.
科学家研究得出了地球上的温度正在慢慢升高的结论.