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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

D

标签：theinyoueveningworking

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