Mother’s Day is the day when children show their love on their mother on.19/30Mother’s Day is the daywhen childrenshowtheir love on their mother on.(A) Mother’s Day(B) The day (C) When(D) OnGiải thíchChọn đáp án D ⇒ bỏ on Giải thích: mệnh đề quan hệ chỉ thời gian, when = on which