Speaker A: The experiment has been completed hasnt it? Speaker B: ______A.Yes. We need an

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Speaker A: The experiment has been completed, hasnt it? Speaker B: ______

A.Yes. We need another week to complete it.

B.Yes. It has been completed beautifully.

C.No. It was completed last week.

D.No. I have no idea about it.

请帮忙给出正确答案和分析,谢谢!

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