were they at work at that time?
你这句就是否定句
they were not at work at that time 改成一般疑问句和否定句
they were not at work at that time 改成一般疑问句和否定句
就改成疑问句，把not删掉
就改成疑问句，把not删掉
英语人气：808 ℃时间：2019-09-29 01:34:18
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