Human beings are different from animals they can use language as a tool to municate.
A. in that
B. for that
C. in which
D. for which
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(答案→)A. in that
B. for that
C. in which
D. for which
解析： 考查原因状语从句，只有A选项能作为状语从句的连接词。 人类不同于动物因为人类可以利用语言来作为交流工具。 选A