问题描述：
A.finally they came to this conclusion B.they drew this conclusion at last
C.finaaly they reached tothis conclusion
D.they arrived at this conclusion at last
四个句子那个错了,说明原因
C.finaaly they reached tothis conclusion
D.they arrived at this conclusion at last
四个句子那个错了,说明原因
问题解答：
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