— Whose room is this? — It’s .A. Mike and DavidB. Mike’s and David’sC. of Mike and DavidD.

问题补充：

— Whose room is this?

— It’s .

A. Mike and David

B. Mike’s and David’s

C. of Mike and David

D. Mike and David’s

答案：

A. Mike and David

B. Mike’s and David’s

C. of Mike and David

(答案→)D. Mike and David’s

解析：本题考查代词。表示共同拥有某物时，只在最后一个人的后面加’s即可，故选D.句意：——这是谁的房间？——是马克和大卫的房间。