现在完成时句型转换The door opened thirty minutes ago.→______thirty minutes since the door______.For opened?

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现在完成时句型转换The door opened thirty minutes ago.→______thirty minutes since the door______.For opened?
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现在完成时句型转换The door opened thirty minutes ago.→______thirty minutes since the door______.For opened?
现在完成时句型转换
The door opened thirty minutes ago.
→______thirty minutes since the door______.
For opened?

现在完成时句型转换The door opened thirty minutes ago.→______thirty minutes since the door______.For opened?
The door opened thirty minutes ago.
→(It's) thirty minutes since the door (opened).
门是30分钟前打开的.门开了有30分钟了.
第二句是把一般过去时变为了现在完成时.

The door opened thirty minutes ago. 答案应该是:
→It is/ has been thirty minutes since the door opened.

It's been, opened.