In one corner of the garden there stands a tittle board “Keep off the grass．”A. On which w

问题补充：

In one corner of the garden there stands a tittle board，“Keep off the grass．”

A. On which writes

B. it says

C. on which is read

D. which reads

答案：

A. On which writes

B. it says

C. on which is read

(答案→)D. which reads

解析：which 代替先行词a tittle board，“上面写着”用read 或say。B选项应改成which says 或and it says。所以答案D。