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Sometimes accidents can happen even though scientists try to make sure nothing goes wrong.The reason is that space is too complex
to face
to face
（face）.However，the desire
to know
to know
（know） more about the secrets of the universe will never die.

【答案】to face；to know

【解答】

【点评】

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发布：2024/7/7 8:0:9组卷：0引用：0难度：0.8

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Sometimes accidents can happen even though scientists try to make sure nothing goes wrong.The reason is that space is too complex to faceto face（face）.However，the desire to knowto know（know） more about the secrets of the universe will never die.