题目内容
将下列句子改为否定形式,每空一词,缩写算一词:There's an old book on the desk.
There ______ an old book on the desk.
答案:isn't
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题目内容
将下列句子改为否定形式,每空一词,缩写算一词:There's an old book on the desk.
There ______ an old book on the desk.