B
固定形式 it's time for sb.to do sth.表示是某人做某事的时候了
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It’s time （）the students （）morning exercises A for doing B for to do C to for doing D to to do
It’s time （）the students （）morning exercises A for doing B for to do C to for doing D to to do
英语人气：566 ℃时间：2019-10-23 06:21:41
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