虚拟语气一坚持二命令三建议四要求后接should do

request作“要求”讲时，后面可以跟宾语从句，从句用虚拟语气，即其谓语部分用“should＋动词原形”，其中should可省略。与此用法相同的还有：

一坚持(insist)

二命令(order，command)

三建议(advise，suggest，propose)

四要求(demand，require，request，desire)

This is his only request that the room __________ after being used.

A．be cleaned　 B．would be cleaned

C．is cleaned D．will be cleaned

答案A should be cleaned should被省略。

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