Wilson: Hello. May I speak to Mary? Mary: ______A.Sorry the number is engaged. Will you h

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Wilson: Hello. May I speak to Mary? Mary: ______

A.Sorry, the number is engaged. Will you hold?

B.Yes, speaking.

C.Hello. Who are you, please?

D.Hello. Thank you for calling.

请帮忙给出正确答案和分析,谢谢!

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