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

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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