While he was working,she _____.A\sleep.B\was sleeping C\slee

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While he was working,she _____.A\sleep.B\was sleeping C\sleeping D\slept .
为什么答案是B,D不何不行呢

while表示两个动作同时进行,while后面的动词一定是延续性动词,主句的谓语动词就不一定了.如果主句的谓语动词也是延续性动词,则主句和从句的谓语动词都必须用doing的形式；如果主句的谓语动词是短暂性动词,则只能用一般过去时的形式.如：
While the students were reading,the teacher came in.
注意：如果短暂性动词作时间状语,只能用when引导.如：
When the teacher came in,the students were reading.
这一题如果she后面是一个短暂性动词,就可以选D.

While he was working,she _____.A\sleep.B\was sleeping C\slee 2、Where’s John?.A:He’s sleeping.B:She’s sleeping.C:He’s slee Whese's Johm? A He's sleeping. B She's sleeping. c He's slee I like ( ) in spring and winter.A sleep B sleeping C to slee i was hot and i couldn ' t ( ) A asleep B sleeping C sleep D It was while she was sleeping in her bedroom ____ a thief br 同义句转换 While she was working in the field,she was bitten by a He was still ____ when I came in.A.sleeping B.sleepy C.aslee our body rests while we are ——A.sleeping B.sleep C.sleeps --she was very tired,she went on working.A; as B;although C; As he was so tired he soon fell_.A.slept B.asleep c.sleep d. ______ he was tired he went on working.A.Even B.Yet C.Althou