题目内容
17.汤姆过去害怕狗.Tomused to be afraid ofthe dog.
分析 used to be afraid of.
解答 答案:used to be afraid of.表示过去常常用used to do sth,表示害怕…be afraid of,of是介词,后可加名词,故答案是used to be afraid of.
点评 used to do 过去常常做某事
be used to doing 习惯于做某事 be used to do sth被用来做某事
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