题目内容：

( )is fun to learn another language
A This
B That
C Someone
D It
选什么,为什么

优质解答

选D,啦,it is fun to learn another language这句话中it是形式主语,没有实际意义,真正的主语是不定式短语“to learn another languange,”也就是说这句话本来可以写成这样的To learn another language is fun为什么...