1.答案:A/D.
2.翻译:作为一名篮球选手,如果不会比他的兄弟更好的话,他(至少)也和他的兄弟一样好.
3.
1)as a basketball player是介宾短语,意思是“作为一名篮球选手”.
而as for的意思是“至于/关于...”,与句意不符,排除C;
like a basketball player意思是“像/比如一名篮球选手”,句意也不通顺,排除B.
2)而楼主把AD两个答案达成一样了.
此句可以改写为:
As a basketball player,he is as good as his brother,if (he is) not better than his brother.