It is essential that the temperature not be elevated to a point______ the substance formed may become unstable.

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问题 It is essential that the temperature not be elevated to a point______ the substance formed may become unstable.

选项 A、that
B、on which
C、where
D、when

答案C

解析 where相当于at this point the substance formed may become unstable,在从句中作表示位置的状语,不表示时间(when)。
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