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---Why haven’t you asked her to come here?
---She _______ an important experiment when I found her and she _____ it.
A．had done; didn’t finish
B．was doing; hasn’t finished
C．did; wouldn’t finish
D．has done; hadn’t finished
B
你為什么沒讓她來這里呢？ 可以判斷她沒有來。她還在做實驗 所以她還做完實驗， she hasn’t finished it. 對現在產生了影響，而且還沒有完成，所以用現在完成時。當我找到她的時候，她在做實驗。過去進行時的概念。
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