问题补充:
----It’s important a foreign language.
----I agree with you. We should study hard.
A. of us to learn
B. for us to learn
C. of us learning
D. for us learning
答案:
A. of us to learn
(答案→)B. for us to learn
C. of us learning
D. for us learning
解析:it可指代下文内容做形式主语,其主要有两种形式:1、Its + 形容词 + of + sb + to do sth.这个句型,形容词一般为sb的所具有的一种品质性格。2、Its + 形容词 + for + sb + to do sth.这个句型,形容词不是sb所具备的品质性格。That无此用法。句意:对于我们来说,学一门外语很重要。——我同意你的看法。我们应该努力学习。结合语境可知选B。