It’s easy English and it’s important it.A. study, useB. say, speakC. speak, sayD. to lear

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A. study, use
B. say, speak
C. speak, say
(答案→)D. to learn, to practice
解析：根据语境可知此句的含义是学习英语非常简单，不过练习英语是非常重要的。考查的动词不定式是做主语，常用it做形式主语，故选D。