1、I dont know you were good friends .You ------,i hace known

1、I dont know you were good friends .You ______,i hace known her since she moved here.You were studying abroad then .A:may have B:neednt have B couldnt have D\must have 请讲解为什么正确答案是C 2、I wonder what will become of my daughter____endless homework ,she also bears other leading loads such as revision and reciation A\as well as B with Cexcept D rather than答案是A为什么