你写完了作业么?Have you finished your homework?为什么是have done而不是have been doing?

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• 你写完了作业么?Have you finished your homework?为什么是have done而不是have been doing?
• 你写完了作业么?Have you finished your homework?为什么是have done而不是have been doing?
• I would rather _____ (watch) TV at home than ____ (go ) to the movies
• When did you start your work?——I__it until 11:50p.m.I think I__finish it today.A.started to do /can't B.didn't start to do/can C.started do/can D.didn't start to do/can't到底是b还是d啊？