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David,turn off the TV ___ no one is watching it.But it ____

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David,turn off the TV ___ no one is watching it.But it ____ off already!
David,turn off the TV ___ no one is watching it.
But it ____ off already!The music is from the radio.
A so that,has been turned B when ,has turned
C if ,has been turned D because ,has turned
为什么不选B,D
David,turn off the TV ___ no one is watching it.But it ____
这是一组对话
A:David,如果没人看电视就把电视关了
B:电视已经关了!声音是收音机发出来的.
由B的话可以知道A不知道声音是从哪里发出的,所以可能并不能看到有没有人看电视(或许不在电视的房间),所以用If,表如果.
可以感觉一下,其他选项都不合适.