the boy doesn't speak---his sister,but his witten work is ve

这道题目选 Athe boy doesn't speak 。as well as his sister,but his witten work is very good。意思是：这个男孩不像他姐姐口语说的那么好,但是他笔头功夫很好。as well as 是像。。一样好。至于不能选b的原因是这里用well是副词,才能修饰speak。