—David, turn off the TV ______ no one is watching it. —But it ______ off already! The music is from the radio.

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问题 —David, turn off the TV ______ no one is watching it.
   —But it ______ off already! The music is from the radio.

选项 A、so that; has been turned
B、when; has turned
C、if; has been turned
D、because; has turned

答案C

解析 本题考查条件状语从句和现在完成时的被动语态。根据第一句中的分句no one is watching it和turn off the TV可知,应用表示条件关系的连词if;第二句是说电视已经被关掉了,应用现在完成时的被动语态,故选C。
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