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  3. Both the scientists understood that the air was a mixture of two gases,____was "combustible" and the other "useless".

Both the scientists understood that the air was a mixture of two gases,____was "combustible" and the other "useless".

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问题 Both the scientists understood that the air was a mixture of two gases,____was "combustible" and the other "useless".
选项 A、which
B、that
C、one of which
D、one of that
答案C
解析
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