l didn't know you were so busy ,这里怎么有两个过去式?
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中间省略that
原句 I didn't know that you were so busy.后面是从句.
======以下答案可供参考======
供参考答案1:
这是宾语从句，主句是一般过去时，从句要用相应的过去时。
l didn't know（主句） you were so busy （从句）
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