Question

Although we’ve learned English for years, we have trouble _____ the       foreigners.

A．understand

B．to understand

C．understanding

D．of understanding

Answer 1

C

试题分析：考查固定短语have trouble in doing sth (in可省略)，做某事有麻烦。故选C。
点评：have trouble in doing sth (in可省略)，做某事有麻烦。英语中这样的短语很多，需要牢记这些用法。