A cough is usually nothing to worry about unless it lasts for ten days . A. or more B. instead C. at most D. only 题目和参考答案——青夏教育精英家教网——

题目内容

A cough is usually nothing to worry about unless it lasts for ten days ___.

A. or more B. instead C. at most D. only

A

解析:

表示“咳嗽如果持续十天或者十天以上，就要引起注意”。

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