问题描述：
请帮我看看为什么这个句子要用过去进行时态
The workers were all sleeping like a log,even without knowing when the boss had arrived.
这个句子为什么要用were ..sleeping.就用过去时难道不行吗?
The workers were all sleeping like a log,even without knowing when the boss had arrived.
这个句子为什么要用were ..sleeping.就用过去时难道不行吗?
问题解答：
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