20.My mother was a doctor in the past.(同義句轉(zhuǎn)換)
My motherusedtobea doctor.

分析 我的媽媽過去是一名醫(yī)生.

解答 答案:used to be.
結合上文是說過去時一名醫(yī)生,表示過去常常用used to do,故答案是used to be.

點評 1.used to do sth.過去常常做某事,(意思現(xiàn)在不做了)
例:I used to get up early and take an hour's walk before breakfast.
我過去常常起床很早并且在早餐前散步一小時.
2.be used to doing sth/be used to sth.是指習慣于做某事.(這里的to 是介詞.)
例:She isn't used to living in the countryside now.
她不習慣在鄉(xiāng)下生活.

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