I failed in the final examination last term and only then __
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答案D

only位于句首,修饰副词,介词短语或状语从句时,句子采用部分倒装的语序; 修饰状语从句时,只有主句采用部分倒装语序,从句不可倒装.例如:Only by practicing a few hours every day will you be able to master the language.此外,only修饰主语时,句子不倒装.例如:Only he can answer the question.