问题
选择题
A cough is usually nothing to worry about unless it lasts for ten days ____. [ ]
A. or more
B. instead
C. at most
D. only
答案
答案：A
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A cough is usually nothing to worry about unless it lasts for ten days ____. [ ]
A. or more
B. instead
C. at most
D. only
答案：A