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问题: 用括号中所给单词的适当形式填空。It's fun ___ another language.(learn)

应该填 to learn 还是 learning,或是其它?

解答:

应填 to learn
It is +adj.+to do sth.
it是形式主语,to do sth是真正的主语,但通常to do sth不定式短语较常,一般放在后面.