There are certain ________ when you must interrupt people who are in the middel of doing something
问题描述：
There are certain ________ when you must interrupt people who are in the middel of doing something
a conditions b situations c occasions 求权威老师 帮我分析分析
答
选C.句意为：当别人正在做事情时,你必须要有恰当的理由才能去打断别人.
A为情况,B多表示位置、处境,C表示时机,理由