【題目】______ 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. 這個(gè)句型中的adj.是用來形容sb.的, 表示某人這么做真是太…….了;而It is +adj.+for sb.+to do sth表示做某事對(duì)某人來說很……,這里的adj.是do sth.的屬性,里面的sb.跟adj.沒有直接聯(lián)系 。本句意思是:對(duì)我們來說,了解一門外語很有用。故選 B。

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