题目内容
17．欧文过去常常在拼写"发音"这个单词时出错．Owenusedtomake the mistakes in spelling the word"pronunciation"．
分析 used to．
解答 答案：used to．结合句意是说过去常常结合句子结构，后面是动词原形make，用used to do sth，故答案是used to．
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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