听力原文:M: When do you think Miss Harris will be back?W: When she left at 5:15 she promis

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听力原文:M: When do you think Miss Harris will be back?

W: When she left at 5:15 she promised to be back in 20 minutes.

Q: When will Miss Harris return?

(18)

A.5:35.

B.5:15.

C.5:30.

D.5:20.

请帮忙给出正确答案和分析,谢谢!

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