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

问题描述:

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

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

to sing
be used to do sth 习惯于做某事

to singing
be used to doing 习惯于做某事
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