Question

16. He was absent again, which              to carry on with the work. (make)

他又没来，这使得我们要继续这项工作有困难。

Answer 1

 16. made it difficult for us考查it作形式宾语的用法。本题中it代替后面的不定式"to carry on with the work"作形式宾语，difficult作宾语补足语，构成复合宾语的结构。类似这样的常用动词还有feel / think / find...,接it作形式宾语，代替后面的不定式或从句。