After _______ testing it, we could officially receive governmental approval for the recently developed part.

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问题 After _______ testing it, we could officially receive governmental approval for the recently developed part.

选项 A、through
B、thoroughly
C、thorough
D、thoroughness

答案B

解析 after是连词，testing的原形是动词test，这里用的是现在分词形式。应当用副词来修饰动词。当testing不是作为动名词而是作为名词使用时，就要写成a thorough test (ing)的形式，前面加冠词，用形容词做修饰语，而且后面也不加宾语。

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