2. 专升本
  3. Not until a monkey is several years old______to exhibit signs of independence from its mother.

Not until a monkey is several years old______to exhibit signs of independence from its mother.

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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 not until位于句首时，须用部分倒装，助动词提至主语之前。故选C。
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