2. 外语
  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.

admin2012-06-19  58
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 否定词not用于句首，要用倒装句，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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