They student sat together,__happily.A sing B to sing C singing D and singing

They student sat together,__happily.A sing B to sing C singing D and singing TOG是什么? SAT中的Student Answer Service有用么? tog animals的意思 tog ther with me They are both student.改同义句 they are all student与they all are student的区别 数学中tog a是啥意思 SAT报名中 *Student's Email Address:*Confirm Student's Email是什么?有什么区别 可以写一样的吗? SAT SAT Sat sat sat SAT SAT SAT SAT