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You used to be quiet, ________ you?
A.usedB.didC.didn’tD.aren’t
C

试题分析;句意:你过去很内向,是吗?used to do sth过去常常做某事,这个结构也有词形变化,其疑问及否定句一般要借助于助动词did来构成,本句前文为肯定形式,故反问部分用否定形式,选C。
点评:used to的用法比较固定,需要注意的是used to do表示过去常常做某事,be used to表示习惯于某事。前者to是不定式符号,后接动词原形。后者to是介词,后接名词或者名词性短语。Used to do结构中use相当于行为动词,有词形变化。Be used to中used相当于形容词,如词形变化。
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