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

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

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问题 ______his number for an hour only to hear a busy signal, she became impatient and called the operator for assistance.
选项 A、Dialing
B、Dialed
C、Having dialed
D、To dial
答案C
解析 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。
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