5()his number for an hour only to hear a busy signal, she became impatient and calledthe operator for assistance..<br>A . Dialing<br>B . Dialed<br>C . Having dialed<br>D . To dial

5()his number for an hour only to hear a busy signal, she became impatient and calledthe operator for assistance..
A . Dialing
B . Dialed
C . Having dialed
D . To dial

出自：伊犁师范-英语语法

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