There are certain ______ when you must interrupt people who are in the middle of doing something.
A、conditions
B、situations
C、occasions
D、environments
【正确答案】：A
【题目解析】：occasion“场合，时刻”；condition“条件”；situation“位置，形式”；environment“环境”。句意：“有些时刻你必须打断那些正在忙着事儿的人。”故选C。