A cough is usually nothing to worry about unless it lasts for ten days A. insteadB. or mor

问题补充：

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

A. instead

B. or more

C. at most

D. Only

答案：

A. instead

(答案→)B. or more

C. at most

D. Only

解析：句意：咳嗽通常没什么可担心的除非一直持续十天左右。instead 代替；or more 大约，左右，放在数字之后相当于about，但是about常位于数字之前。at most至多；only仅仅。将四个选项带入分析语境，B 最佳。

考点: 考查副词的用法。