Speaking as much as possible is

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Speaking as much as possible is_____ in the study of language.
选Dof great importance 是固定词组,解释为很重要
A不用with搭配
Bimportance是名词,不能直接这样用的
C句意不对======以下答案可供参考======
供参考答案1:
选D，of great importance = very important
英语里有一些名词用 of +great/little/no+ n.(value, benefit, use)等等，相当于very +adj.
如： The book is of great value.= The book is very valuable.
这句翻译成：尽量多说在英语学习中很重要。
供参考答案2:
D供参考答案3:
D