________ 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(yǔ)從句。句意：被延誤的航班何時(shí)起飛依天氣而定。題干中主句的謂語(yǔ)動(dòng)詞為depends，為此前面是主語(yǔ)從句。Why在主語(yǔ)從句中做原因狀語(yǔ)；when在主語(yǔ)從句中作時(shí)間狀語(yǔ)；that在主語(yǔ)從句中不做任何成分；what在主語(yǔ)從句中作主語(yǔ)或賓語(yǔ)。根據(jù)語(yǔ)境判斷主語(yǔ)從句中缺少時(shí)間狀語(yǔ)，故選B。
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