2. 外语
  3. Not until a monkey is several years old______ to exhibits signs of independence from its mother.

Not until a monkey is several years old______ to exhibits signs of independence from its mother.

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问题 Not until a monkey is several years old______ to exhibits signs of independence from its mother.
选项 A、it does begin
B、when it begins
C、before it begins
D、does it begin
答案D
解析 本题考查倒装句。句意：猴子直到几岁的时候，才会表现出从母亲那里独立的信号。not until位于句首时，句子要用部分倒装，其结构为：not until+从句／表时间的词+助动词+(主句)主语+谓语+其他。故本题选D。
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