______his number for an hour only to hear a busy signal she became impatient and called t

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______his number for an hour only to hear a busy signal, she became impatient and called the operator for assistance.

A.Dialing

B.Dialed

C.Having dialed

D.To dial

请帮忙给出正确答案和分析,谢谢!

热搜:关于氨基酸代谢错误的论述是_________。

答案解析

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  • 正确答案:C
    本题考查非谓语动词,独立结构的逻辑主语与主句主语相同,所以用现在分词的完成时态。题意为,已经拨了一个小时他的号码都只是听到忙音,她不耐烦起来,打电话请接线员帮忙。