2. 专升本
  3. Do not disturb me. I_____ letters all morning and have written ten so far.

Do not disturb me. I_____ letters all morning and have written ten so far.

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问题 Do not disturb me. I_____ letters all morning and have written ten so far.
选项 A、write
B、have written
C、was writing
D、have been writing
答案D
解析
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