Scientists say human activity contributes to climate change, but they do not agree on the

Scientists say human activity contributes to climate change, but they do not agree on the rate climate change may be developing.
A. with which
B. with that
C. at which
D. at that

A. with which(答案→)B. with thatC. at whichD. at that解析：此处with是介词，其后是介词的宾语从句，that在宾语从句中不作成分，没有意思，只起连接作用。句意：科学家们说人类活动导致气候变化，但是他们不同意气候变化的速度。

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