Question

4.        that there were so few visitors coming to our city? (come)

怎么会出现这样的情况，来我们城市的游客如此之少？

Answer 1

4. How did it come about本题考査主语从句。 it 是形式主语，代替由that引导的真正的主语从句。 come about为固定短语，相当于happen。