母亲偷东西:I was drawing a horse_____the teacher came in.

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A while B as C when D the moment
为什么?请说明原因。谢谢！

用C，这4个选择都表示“在……的时候”，但因为后面是句子，而且，这句是固定句型，“当……的时候，我正在……”，两个动词同时发生，主动词用过去进行时，副动词用一般过去时，两句句子用WHEN连接。

c 后接句子 用when

I was drawing a horse_____the teacher came in. I saw Miss Zhao. She was drawing a picture.改为同意句Miss Zhao ___ ____ ______ a picture. she was drawing with a pencil when the teacher asked her a question When I was a child,I------ride a bike. I was late because there was a lot of t_____ I was ( a ) at the strange noise I was (a ) at the bad news i was bron in a small village when I was just a little girl i wish i was a punk rocker girl