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

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

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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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