考试
2020-03-16 07:48:13

6791 It is essential that the

题目描述

It is essential that the temperature not be elevated to a point______ the substance formed



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

A.that

B.on which

C.where

D.when

请帮忙给出正确答案和分析,谢谢!

答案解析

Cwhere相当于atthispoint

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