A:5
B:4
C:3
D:2
只因滴水的坚持,磐石能被穿透;只要不停地磨洗,铁杵也能成针;只因锲而不舍,金石最终可镂……这启示我们,要成就一番事业,必须( )
—Must I finish the homework tonight? —No, you .You can finish it tomorrow.