问题补充：
This is his only request that the room after being used．
A. is cleaned
B. will be cleaned
C. would be cleaned
D. be cleaned
答案：
A. is cleaned
B. will be cleaned
C. would be cleaned
(答案→)D. be cleaned
解析：考察动词的虚拟语气 句意为:他唯一的要求就是房间在使用之后务必打扫干净。
Request做要求讲，后跟从句，从句谓语需要虚拟语气的形式。
考点:考察动词的虚拟语气
