The trees ( )we planted five years ago have grown very big A,that B,whome,C,by which D,why
问题描述：
The trees ( )we planted five years ago have grown very big A,that B,whome,C,by which D,why
答
答案：A
这里先行词是物,关系代词用that或者which,由于that、which在句中作宾语,还可以省略.