she was___(serve) in the kitcher when the light went out填什么为什么

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she was___(serve) in the kitcher when the light went out填什么为什么

用进行时态
serve===serving

因为在灯熄灭的瞬间,她正在做的事情,所以用进行时态.

she was serving in the kitcher when the light went out
灯熄写时,她正在厨房准备上菜.

用serving
she was serving in the kitchen when the light went out。 过去进行时