Is thisthe research center you visited thelablast year ?A. whichB. the oneC. thatD. wher

问题补充：

Is thisthe research center you visited thelablast year ?

A. which

B. the one

C. that

D. where

答案：

A. which

B. the one

C. that

(答案→)D. where

解析：可联系答.案.网客服索取。