Only recently ______ possible to separate the components of fragrant substances

游客2025-04-24 63

问题 Only recently ______ possible to separate the components of fragrant substances and to determine their chemical composition.

选项 A、it becomes
B、having become
C、has it become
D、which becomes

答案 A

解析

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Onlyrecently______possibletoseparatethecomponentsoffragrantsubstances