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________ the delayed flight will take off depends much on the weather.
A.WhyB.WhenC.ThatD.What
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。
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