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。
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