He walked to the office and then(  D   )the door.【为什么不选A,选D呢】
A.knocked   B.hit    C.answer   D.knocked at
Your needn't( )on your own【不理解为何选的是B选项】
A.came  B have   come   C.to come  D.to have come
Tell me ,( )she finish the tasks right now?【为什么不选A,选D呢】
A.needs  B.needed  C.has needed  D.need
He was (   )moved  by  the  story of the  teacher【这句话意思看不懂】
A.final  B.eventually   C.deeply   D.deep