Question

单句改错

1．He suddenly remembered yesterday that he has left his keys at home．

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2．By eleven o’clock yesterday we arrived at the airport．

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3．My friend told me he read the article long before．

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4．Three days ago, I had come across my first teacher in the department．

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5．They couldn’t leave until they have done their work．

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Answer 1

答案：
解析：

1．has→had 　　2．arrived前加had 　　3．read前加had 　　4．had come→came 　　5．have→had