Question

________ the delayed flight will take off depends much on the weather. A．Why B．When C．That

________ the delayed flight will take off depends much on the weather. A．Why B．When C．That D．What

Answer 1

B
试题分析：考查
主语从句
。句意：被延误的航班何时起飞依天气而定。题干中主句的
谓语动词
为depends，为此前面是主语从句。Why在主语从句中做原因状语；when在主语从句中作
时间状语
；that在主语从句中不做任何成分；what在主语从句中作主语或宾语。根据语境判断主语从句中缺少时间状语，故选B。