问题补充:
Isn it very kind your parents to do that for us?
A. for B to C. about D. of
答案:
解析:本题是固定用法的考查。It is+形容词+of/for+sb.+to do是固定的句型。但两个句型用法不同,如果形容词表示人的性质,如kind,nice等必须用of。
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