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题目内容
（伊犁师范-英语语法）
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
A . Dialing
B . Dialed
C . Having dialed
D . To dial
参考答案
