题目内容

7．Someoneis knocking （knock） at the door．Go and see who it is．

分析 有人正在敲门．去看看是谁．

解答 答案：is knocking．
根据Go and see who it is，可知去看看是谁．从这里可以判断前面说的是有人正在敲门，所以这里句子使用现在进行时，构成：am/is/are+Ving．Someone为不定代词是单数，故填is knocking．

点评 本题考查用所给单词的适当形式填空，首先要根据语境明确句意，然后再根据相关语法对所给单词在形式上做出正确的变化．

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