题目内容
12．Tom，would you please go and see who isknocking at the door？（敲，击）分析 汤姆，请你去看一看谁在敲门好吗？
解答 答案：knocking．
根据提示汉语结合语境推测句意是"汤姆，请你去看一看谁在敲门好吗？"，根据句意结合设空处前面的is判断填动词的现在分词构成现在进行时，"敲"的英文是knock，所以答案是：knocking
点评 做这类题型，首先根据所给汉语明确句子所要考查的单词或短语的拼写，再结合相关语法知识对单词或短语做出形式上的变化．
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