过去进行时中的陈述句为什么I was 而不是用I were

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• She (was dropping) the tray when I spoke to her.为什么前半部分过去进行时,后半部分过去时She (was dropping) the tray when I spoke to her.为什么前半部分是过去进行时,后半部分是过去时?而不是前半部分是过去时,后半部分是过去进行时?
• She ____(drop) the tray when I ____(speak) to her dropped spoke为什么后面用的是spoke而不是was speaking
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