问题

Misunderstandings________from lack of social communication,unless________properly,may lead to serious problems
A:who; why
B:that; that
C:which; when
D:what; how
B:that; that
C:which; when
D:what; how
正确答案是:
同类题型
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He is a politician and has a delicate sense of the current affairs all over the country.