Question

Not unti his fellows criticized him _______ to admit his mistake.

A．does he begin

B．did he begin

C．began he

D．had he begun

Answer 1

B

not until 位于句首，句子使用部分倒装。观察句子，从criticized可知句子应与过去有关，排除A；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。