题目内容
12.No one knowsexactly(exact) how the earth began,as it happened so long ago.分析 没有人精确地知道地球是怎么开始的,因为它发生在很久以前.
解答 答案是exactly.考查副词.句意是"没有人精确地知道地球是怎么开始的,因为它发生在很久以前."所以用副词exactly表示"精确地",修饰动词knows.故答案是exactly.
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动.
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