A new material of which water pipes are made has already ________ steel or iron in industry．

A new material of which water pipes are made has already ________ steel or iron in industry．

A.controlled

B.rebuilt

C.placed

D.replaced

答案及解析： D

解析：

考查动词词义辨析。replace代替，取代；

control控制；

rebuild重建；

place放，搁。