Look!Paul is skiing very well. I _______ he_________ski.

问题描述:

Look!Paul is skiing very well. I _______ he_________ski.
A, know,can't B,knew;can't C,don'tt can't D,didn't know;could

答案选D
Paul能够滑冰滑得很好,本身出乎说话人的意料
后半句意思是,“我原来不知道他会滑冰”
用过去式