Speaker A:The biology seminar will begin on August 21st. Speaker B;So it has been set afte

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Speaker A:The biology seminar will begin on August 21st. Speaker B;So it has been set after all.______.

A.I thought we need a couple of days to decide

B.It"s too long to setde it down

C.How terrible it is to put it off

D.August 21st is an unlucky day

请帮忙给出正确答案和分析,谢谢!

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