I would like to buy a T-shirt ( ) my mum.A as B to

问题补充：

I would like to buy a T-shirt ( ) my mum.A、as B、to C、for D、by

答案：

应该选C、for

buy sth for sb ：为某人买某物,给某人买某物

I would like to buy a T-shirt ( for ) my mum.我想给妈妈买件T恤.