Do you have any trouble the foreigners?A. to understandB. understandingC. understandD. und

问题补充：

Do you have any trouble the foreigners?

A. to understand

B. understanding

C. understand

D. understood[

答案：

A. to understand

(答案→)B. understanding

C. understand

D. understood[

解析：考查短语：have trouble (in)doing sth做什么事情有麻烦，句意：在理解外国人方面你有麻烦吗？所以选B。