问题补充：
the climate changes so much has caused many discussions among the scientists.
A. What
B. Which
C. When
D. That
答案：
A. What
B. Which
C. When
(答案→)D. That
解析：考查名词性从句。从句结构完整，所以用that来引导主语从句。
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时间：2019-09-12 17:54:57
the climate changes so much has caused many discussions among the scientists.
A. What
B. Which
C. When
D. That
A. What
B. Which
C. When
(答案→)D. That
解析：考查名词性从句。从句结构完整，所以用that来引导主语从句。
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