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When I noticed the puzzled look on his face, I realized that

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When I noticed the puzzled look on his face, I realized that he didn't understand me
句首的when为什么不能用until代替
用until时它的主句的谓语动词要用延续性.但realize并不是.所以不用.如
We waited until they came back.
再问： He didn't come back until I went to sleep. come 可以算延续性动词吗
再答： 主句是否定句谓语动词要用非延续性动词。如你说的句子。当主句是肯定句，谓语动词是延续性的。
When I noticed the puzzled look on his face, I realized that so the man had puzzled look on his face 这句话最准确的意思是什么 puzzled和 puzzling 的区别14.The __ look on his face suggested .. the puzzled look on her face suggested that she hadn't expec I noticed that the boy ____with no tears in his You should have seen the look on her face when I told her I_ when I locked the door,（）I realized i had left my key on the when I look back on these days I will look and see your face the expression on his face suggested that he angry so i sugg When I came to the check—out,I realized that I had no money when i got to the check-out,i realized that i ___(not bring) When I was at the grocery store,I realized that the prices o