Speaker A: I sent a package to Dallas two days ago and it still hasn t arrived. My trackin

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Speaker A: I sent a package to Dallas two days ago and it still hasn t arrived. My tracking number is 641-24. Speaker B: Ok, Mr. Smith.______but our delivery person said that there was no such address.

A.Don"t be angry,

B.Stay calm,

C.Thanks for asking me,

D.We attempted to deliver it,

请帮忙给出正确答案和分析,谢谢!

热搜:a是b的充分条件,b是a的必要条件吗