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

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

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

试题答案

答案:D

提示:

根据句意“你必须晚上一直工作,……你……确保及时完成这个任务”可知填unless 为最佳答案,意思是“如果不”。