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 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”。 |