When the pressure gets low, the boiling-point becomes low.气压变低，沸点就变低。
A: omission
B: combination
C: addition
D: obverse
A: omission
B: combination
C: addition
D: obverse
举一反三
- 原文：When the pressure gets low, the boiling point becomes low.译文：气压低，沸点就低。请问这句话一共省略了哪些词类？省略了______ ；省略了______ ；省略了______ 。
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