问题
选择题
Not until his mother came in ________to prepare his lessons.
A．did the boy begin
B．the boy began
C．began the boy
D．the boy did begin
答案
答案：A
not until 位于句首，句子使用部分倒装。C答案为完全倒装。
点评：倒装分为部分倒装和完全倒装。要分清他们的概念及使用规则。
