陶瓷纤维防火布:呵呵,麻烦各位了
来源:百度文库 编辑:杭州交通信息网 时间:2024/05/05 10:42:12
The tudents in my English class made lots of mistakes today.They _____trouble with the lessons.
A.must have B.must have had C.can have D.must be having
请问为什么选A啊,B,D分别错在哪呢?
A.must have B.must have had C.can have D.must be having
请问为什么选A啊,B,D分别错在哪呢?