You must have worked on your dissertation for a long time,______?A、mustn’t youB

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问题 You must have worked on your dissertation for a long time,______?

选项 A、mustn’t you
B、needn’t you
C、didn’t you
D、haven’t you

答案 D

解析

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Youmusthaveworkedonyourdissertationforalongtime,______?A、mustn’tyouB