问题
选择题
—What will your parents do?
—They will go on a ______ visit to Beijing.
A. seven day B. seven-day C. seven-days
答案
答案：B
题目分析： a seven-day visit一个七天的访问。有连字符时不能用复数形式。句意：你的父母将去做什么？他们将去北京参观七天。故选B。
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