根据句意从括号中选择正确的单词并填写在空白处. It is that the astronauts do not make a mistake．题目和参考答案——青夏教育精英家教网——

题目内容

根据句意从括号中选择正确的单词并填写在空白处。

It is ________(wrong, essential)that the astronauts do not make a mistake．

答案：essential

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