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 it become
C、has it become
D、which becomes

答案C

解析 本题考查倒装语序。“only+状语”位于句首,句子要用部分倒装,即将助动词或情态动词放在主语前,故答案为C项。
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