Not until a monkey is several years old ______ to exhibit signs of independence

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问题 Not until a monkey is several years old ______ to exhibit signs of independence from its mother.

选项 A、it does begin
B、when it begins
C、does it begin
D、before it begins

答案 C

解析考点倒装。否定词not用于句首，要用倒装句，该句型使用部分倒装，即把句子谓语的情态动词或助动词提到主语前面。

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Notuntilamonkeyisseveralyearsold______toexhibitsignsofindependence