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北师大网络教育专科英语一作业3部分答案1、 Seldom _ to the library during his college days. he went did he go does he go he goes 2、 Many students were seen _ in the last exam. being cheating to cheat cheat cheated 3、 The house _ roof is blue has just been finished. whose which that whom 4、 Who will know how to _ the system? permit found employ operate 5、 I have a _ idea of what I want to express. generous general regular widespread