问题

_______the number for 10 minutes only to hear a busy signal she became impatient and ca

_______the number for 10 minutes only to hear a busy signal, she became impatient and called the operator for assistance.

A.To dial

B.Having dialed

C.Dialing

D.Dialed

请帮忙给出正确答案和分析，谢谢！

参考答案

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