Not until a monkey is several years old______to exhibit signs of independence fr

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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

解析这是一道语法题，考点是Not until开头的句子，其主句的谓语要用倒装结构。

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