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【题目】______ is useful ______ us to know a foreign language.
A.It; of
B.It; for
C.That; for
D.That; of

【答案】B
【解析】It is+adj.+of sb. +to do sth. 这个句型中的adj.是用来形容sb.的, 表示某人这么做真是太…….了;而It is +adj.+for sb.+to do sth表示做某事对某人来说很……,这里的adj.是do sth.的属性,里面的sb.跟adj.没有直接联系 。本句意思是:对我们来说,了解一门外语很有用。故选 B。

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