Question

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

1. A.
   or more
2. B.
   instead
3. C.
   at most
4. D.
   only

Answer 1

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”。