2. 外语
  3. They had to examine the dead fish before they had a ______ answer as to what killed them.

They had to examine the dead fish before they had a ______ answer as to what killed them.

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问题 They had to examine the dead fish before they had a ______ answer as to what killed them.
选项 A、positive
B、possible
C、tentative
D、normal
答案A
解析 positive a.确实的，明确的；积极的，肯定的；正的，阳性的(如：I gave you positive instructions．There is positive proof that he did it．Can you be positive of／about what you saw? She was positive she had seen it．)。 tentative a.试探(性)的，试验(性)的。normal a.正常的，平常的；正规的。
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