Your _______ effort is absolutely needed to find out what caused this accident.

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问题 Your _______ effort is absolutely needed to find out what caused this accident.

选项 A、cooperatively
B、cooperation
C、cooperative
D、cooperate

答案C

解析所有格和名词之间应填入形容词。所有选项都是从同一单词派生而来，按顺序分别是副词、名词、形容词和动词。

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