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Susan decided not to write her resignation in the office because she didn't want her colleagues to know what she was doing?
请问老师为什么要用was doing而不是had done?
逻辑决定的。她决定不在办公室写离职信，就是由于不想让同时直达她在做什么，而不是干了什么。所以用进行体而不需要完成体。这有哪些奇怪呢？
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