问题补充:
Is it important us learn English well?
A. for, learning
B. for, to learn
C. of, learning
D. of, to learn
答案:
A. for, learning
(答案→)B. for, to learn
C. of, learning
D. of, to learn
解析:本题符合句子结构It is adj for sb to do sth,故选答案为B
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