the students are used __(sing) a song at the beginning of the class.用所给词的正确形式填空

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the students are used __(sing) a song at the beginning of the class.用所给词的正确形式填空
the students are used __(sing) a song at the beginning of the class.用所给词的正确形式
填空

the students are used __(sing) a song at the beginning of the class.用所给词的正确形式填空
to singing
be used to doing 习惯于做某事
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to sing
be used to do sth 习惯于做某事

singing 学生们习惯在课前唱首歌
be used to doing sth 习惯于做某事
used to do sth 过去常常做某事
be used to do sth 被用于做某事