单选题Lincoln’s mother did ___&

问题补充：

单选题Lincoln’smotherdid___manybooks___him.A.what she had buy, toB.what she could buy, forC.all that she had to buy, toD.all she could buy, for

答案：

B解析句中谓语动词did后填写宾语从句 what she could (could 后省略了do ), to buy many books 是目的状语, for sb.意思是:为某人.