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I was getting ready to watch Tv,_________the phone rang

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I was getting ready to watch Tv,_________the phone rang
A.while B.as C.until D.when
I was getting ready to watch Tv,_________the phone rang
D when 意思(就在此时突然) 记住标志是when前面用进行时
i was reading when the light went out.灯灭了
i was about to have dinner when he ran in.
再问: as 为什么不可以呢
再答: 绝对不可以,此处when是特殊用法,不能用as替换