Question

【题目】The teacher commanded that the classroom should_____at once

A. clean B. cleaned

C. be cleaned D. be cleaning

Answer 1

【答案】C

【解析】

考查宾语从句的虚拟语气。句意：老师要求教室立即被打扫干净。that the classroom should_____at once是一个宾语从句，command之后的宾语从句，用should + 动词原形，should可以被省略的虚拟语气，“教室”和“打扫”之间是被动关系，用被动语态，故选C。