Youmustkeeponworkingintheevening

发布时间：2020-07-11 02:16:41

You must keep on working in the evening ________ you are sure you can finish the task in time.













A.as












B.if











C.when











D.unless

网友回答

D解析句意为：如果你没把握按时完成任务，你必须晚上加班。unless=if…not。
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