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.as 为什么不可以呢绝对不可以，此处when是特殊用法，不能用as替换
I was getting ready to watch Tv,_________the phone rang
I was getting ready to watch Tv,_________the phone rang
A.while B.as C.until D.when
A.while B.as C.until D.when
英语人气：976 ℃时间：2020-04-11 19:25:50
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