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

网友回答

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。