问题补充:
It is very important for us English well.
A. learn
B. learning
C. to learn
D. learned
答案:
A. learn
B. learning
(答案→)C. to learn
D. learned
解析:本题中的it是形式主语,真正的主语位于句尾,用动词不定式to do,故选C。
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