What difficulty will you have people when you stay in a foreign country?
A. understanding
B. understood
C. to understand
D. understand
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(答案→)A. understanding
B. understood
C. to understand
D. understand
解析：考查词组;have difficulty (in)doing的变化形式，句意是：当你呆在外国的时候，理解人们会多么难啊。选A。