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问题: 请专家回答。谢谢

1.Human beings are different from aninals ____A___they can use language as
a tool to communicate .
A .in that B.for that C.in which D.for which
为什么用in that ???
1.Tom is coming. With him __D___me,I'm sure I will finish the work on time.
A.helping
B.to help
C.helps
D.help
为什么不用B.to help??
谢谢!

解答:

in that 因为、由于
人类区别于动物的本质是由于可以利用语言作为交流的工具
with sb. doing
汤姆来了,有了他的帮忙,我肯定我会按时完成工作