题目

–Mum, may I go to see a film with my cousin?- You _______ go if you have finished your homework.A. must B. need C. should D. can 答案：【答案】D【解析】句意：——妈妈，我可以和我表妹去看电影吗?——你可以去如果完成了你的家庭作业。考查情态动词辨析。must必须，强调主观意愿；need需要，指有必要；should应该，表建议；can可以，表许可。本句是条件状语从句，主句表示允许，根据if you have finished your homework.可知选D。如图，已知⊙O的半径为5，弦AB=6，M是AB上任意一点，则线段OM的长可能是（ ）A．2.5B．3.5C．4.5D．5.5