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2．Only after David was asked to pay more attention ______ repeating the same mistake．（　　）

A．

he avoided

B．

did he avoid

C．

had he avoided

D．

he had avoided

分析只有戴維被要求多加注意之后，他才避免了犯同樣的錯誤．

解答答案B．"only+狀語/狀語從句"位于句首時，主句用部分倒裝．可排除沒有使用倒裝結構的A和D；根據前面的時間狀語"after David was asked to pay more attention"可知主句中應該使用一般過去時，可排除C；故答案選B．

點評本題考查倒裝句．倒裝分為部分倒裝和全部倒裝，考試多為部分倒裝．考生應掌握什么情況下需要倒裝，并對倒裝后的句子能夠辨認出來．讓學生了解倒裝的基本概念和構成形式，對倒裝句的辨認及正確運用．要對其它各種特殊的句式準確把握．

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