I______to reach Bob on the phone for the last twenty minutes, but the line has been busy.

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问题 I______to reach Bob on the phone for the last twenty minutes, but the line has been busy.

选项 A、am trying
B、have tried
C、tried
D、have been trying

答案D

解析
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本试题收录于: 英语题库普高专升本分类
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