The bus was so crowded that he had a hard time______

题目

The bus was so crowded that he had a hard time______
A.getting off
B.to get off
选哪个?why?

答案

A. getting off
have a hard time (in)doing sth
费很大力气做某事
固定搭配
原句省略了in
公交车太挤了他费了好大力气才下来