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---Are you a teacher?      ---No, but I _______.
A.used toB.used to beingC.used to beD.was used to
C

试题分析:考查不定式的省略:意思是“—你是老师吗?—不是,但我曾经是老师。” used to be 是“过去曾经是”的意思,be used to 是“习惯于……;被用于……”的意思。作固定搭配,不可省略be. 问句有助动词或be动词时 回答要与前面保持一致 若有动词则省略used to 后面的动词以避免重复,如果是be动词则不可省略be动词。选C。
点评:不定式的省略通常都只保留不定式符号to,把后面的内容都省略。只有在不定式符号to后面接be或者have的时候,保留be和have.这道题还考查used to do和be used to do的区别,也是考查重点。
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