这句子不怪。"It was fun getting to know her"是常见说法，你只是不熟悉这“特定”说法。"....是Getting to know her吗？" -> Yes."虚主词只有少数名词搭配动名词" -> (你列的 useles 是形容词) 也因为这侷限于特定的搭配字眼/使用场合，所以一般文法书没有列。(盲目的套的话出问题机率大)Swan的"Practical English Usage"有提到这用法。他的说明是" 'It' can be a preparatory subject for an -ingform. This is usually informal."几个实例: It was nice seeing you.It's no use trying to explain.It's worth going to Wales if you have the time.