What _______(you do) when I phoned you this morning?What were you doing when I phoned you.this morning这个是填were you doing ,可以改成did you doing

What _______(you do) when I phoned you this morning?What were you doing when I phoned you.this morning这个是填were you doing ,可以改成did you doing
What _______(you do) when I phoned you this morning?
What were you doing when I phoned you.this morning这个是填were you doing ,可以改成did you doing

What _______(you do) when I phoned you this morning?What were you doing when I phoned you.this morning这个是填were you doing ,可以改成did you doing
不可以 应用过去进行时was/were + V-ing

不能，因为when强调点时间

不可以
这里指的是我今早打电话给你时你正在做什么，用过去进行时
过去进行时的动词形式是was/were + V-ing 形式
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不能。be doing : 正在做什么事情。
did you do：做过什么事情。
现在进行时强调在某个时间点正在做某事。

不可以的。did是助动词，后面只能加动词原形。而且由when引导的时间状语从句中问的是具体的I phoneed you 那个时刻的动作，所以用were you doing比较符合。