In some English classes,pictures are used( )the students lea

选A
be used to do sth.被用于做某事 该句译为“在某些英语课上,图片被用于帮助学生学新单词”.
used to do sth.过去常常干某事 eg.I used to get up early.我过去常常早起.
used to doing sth.习惯于干某事 eg.I used to drinking a cup of tea before breakfast.我习惯在早饭前喝一杯茶.