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问题: 一道单选题,请大侠们帮忙

Speaking as much as possible is _____ in the study of language.
A.with great importance
B.importance
C.no important
D.of great importance
这是一道初三的题,请大家帮忙做出答案,并给予解答,越详细越好

解答:

d
of +adj+n.是n的形容词格式 显然此处应该填形容词