2. 专升本
  3. After two months’ careful______(observe)the two scientists came to quite different conclusions.

After two months’ careful______(observe)the two scientists came to quite different conclusions.

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问题 After two months’ careful______(observe)the two scientists came to quite different conclusions.
选项
答案observation
解析 句子大意为：经过两个月的仔细观察，两位科学家得出了截然不同的结论。two months’是名词所有格形式，后面跟其修饰的名词，而observe是动词，其名词的形式为observation。
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