1.The students are busy___D____over their lessons.
A.going B.with C.to go D>with going
be busy with 忙于做某事 固定用法
2.I___B____a tie for my father as his fortieth birthday.
A>have had B.have bought C.have paid D.have brought
因为已经买了 对现在有影响 用现在完成时态
希望能够帮到楼主