You used to be quiet, ________ you?
A.usedB.didC.didn’tD.a(chǎn)ren’t
C

試題分析;句意:你過去很內(nèi)向,是嗎?used to do sth過去常常做某事,這個結(jié)構也有詞形變化,其疑問及否定句一般要借助于助動詞did來構成,本句前文為肯定形式,故反問部分用否定形式,選C。
點評:used to的用法比較固定,需要注意的是used to do表示過去常常做某事,be used to表示習慣于某事。前者to是不定式符號,后接動詞原形。后者to是介詞,后接名詞或者名詞性短語。Used to do結(jié)構中use相當于行為動詞,有詞形變化。Be used to中used相當于形容詞,如詞形變化。
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