早教吧 育儿知识 作业答案 考试题库 百科 知识分享

Tobesafeeveryonewearaseatbeltwhentheplanetakesoff.A.isusedtoB.usedtoC.issupposedtoD.isableto

题目详情

To be safe everyone _______ wear a seat belt when the plane takes off.

A.is used to            B.used to       C.is supposed to           D.is able to

▼优质解答
答案和解析
C