________ the delayed flight will take off depends much on the weather.
A．WhyB．WhenC．ThatD．What
B
試題分析：考查主語從句。句意：被延誤的航班何時起飛依天氣而定。題干中主句的謂語動詞為depends，為此前面是主語從句。Why在主語從句中做原因狀語；when在主語從句中作時間狀語；that在主語從句中不做任何成分；what在主語從句中作主語或賓語。根據(jù)語境判斷主語從句中缺少時間狀語，故選B。
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