—Mustwecleantheclassroomnow?　　—No,youneedn't.It 

问题详情：

 — Must we clean the classroom now?

— No, you needn't. It _____ after school.

A. may clean     B. must clean          C. need be cleaned        D. can be cleaned

【回答】

D

知识点：情态动词

题型：选择题