Question

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

1. A.
   understand
2. B.
   to understand
3. C.
   understanding
4. 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。
考点：固定短语have trouble in
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。