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

試題分析；句意：你過(guò)去很內(nèi)向，是嗎？used to do sth過(guò)去常常做某事，這個(gè)結(jié)構(gòu)也有詞形變化，其疑問(wèn)及否定句一般要借助于助動(dòng)詞did來(lái)構(gòu)成，本句前文為肯定形式，故反問(wèn)部分用否定形式，選C。
點(diǎn)評(píng)：used to的用法比較固定，需要注意的是used to do表示過(guò)去常常做某事，be used to表示習(xí)慣于某事。前者to是不定式符號(hào)，后接動(dòng)詞原形。后者to是介詞，后接名詞或者名詞性短語(yǔ)。Used to do結(jié)構(gòu)中use相當(dāng)于行為動(dòng)詞，有詞形變化。Be used to中used相當(dāng)于形容詞，如詞形變化。
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