--Are you a teacher?
--No, but I ________.
A．used toB．was used toC．used to beD．used to do
A

試題分析：考查不定式的省略式：英語的不定式的動詞上文出現(xiàn)過的話，可以省略to后面的動詞，但是be動詞或have一般不省，句意：--你是老師嗎？--不是，但過去是的，選A。
點(diǎn)評：對話的問句有助動詞或be動詞時 回答要與前面保持一致 若有動詞則省略used to 后面的動詞以避免重復(fù)，如果是be動詞則不可省略be動詞
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