【简答题】----How long has Sam been skating? ------He for five hours. A have been skating B has been skating C was skating D has been skated
【多选题】看图讲述是幼儿( )三种能力的综合训练和运用。
【单选题】Tom is late. What ________ to him?
【单选题】下列不属于坦威斯 MK II防抱死制动系统特点的是:( )
【单选题】已知 是等差数列, 是等比数列,公比 且 ,若 , 则( )
【多选题】移动互联网营销借助( )等手机和移动互联网技术。