A cough is usually nothing to worry about unless it lasts for ten days .A.or mor
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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
试题答案
A
解析：考查副词的用法。根据句意可知“持续10天或10天以上”。A“或更多”。B“而，不是，代替”；C“至多”；D．“仅仅”。