A board ________ by the side of the well on which these words ________ ,“Danger．Keep off!”

A board ________ by the side of the well on which these words ________ ,“Danger．Keep off!”

A.set up; wrote

B.put up; wrote

C.was put up; is written

D.was set up; were written

答案及解析： D

解析：

因定语从句中words为复数，故C项错误。