单项选择题
By the time I got home, my grandmother ____ the dinner ...
单项选择题By the time I got home, my grandmother ____ the dinner and was watching TV.（ ）
James got lost in the city, ____ he had to ask for help...
单项选择题James got lost in the city, ____ he had to ask for help.（ ）
高层建筑根据其使用性质、火灾危险性、疏散和扑救难度分为两类，请找出下列哪项是属于二类的项目：( )A.19层...
单项选择题高层建筑根据其使用性质、火灾危险性、疏散和扑救难度分为两类，请找出下列哪项是属于二类的项目：( )
