【題目】He a teacher.

A. used to not B. didn’t used to

C. used to no t be D. didn’t use to be

【答案】D

【解析】

句意：他以前不是老師。used to過去常常，后跟動詞原形。否定形式可以在used后面加not，排除A,C；也可以借助didn’t，used要恢復(fù)原形use，故答案為D。

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