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20.I was driving along,______my own business,_____the police

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20.I was driving along,______my own business,_____the police signalled to me to pull over.
20.I was driving along,______my own business,_____the police signalled to me to pull over.
A. minding which B .minded; when C. minding;when D. minded ;which
21.At first it seemed impossible to put his plan into practice ,but ____it turned out to be very easy.
A. in general B so far C before long D. after all
谢谢,请详解.
20.I was driving along,______my own business,_____the police
20.C drive跟mind是伴随状态,也就是同时发生,用ing形式,如:He sits there,crying.这里的crying也是个伴随状态;when是个非限制从句引导词,引导时间状语.
21.C 这句主要是判断短语意思,in general 总的来说,so far目前,before long不久以后(区分long before,很久以前),after all毕竟.根据句意应该选择C.