2. 专升本
  3. —"The door is open. Could you have forgotten to lock the door?" —"Yes, I______. "

—"The door is open. Could you have forgotten to lock the door?" —"Yes, I______. "

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问题 —"The door is open. Could you have forgotten to lock the door?" —"Yes, I______. "
选项 A、could
B、could have
C、might haven’t
D、can’t have
答案B
解析
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