【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
【单选题】Sam has been appointed ________ manager of the engineering department to take ________ place of George.(2012·重庆)
【单选题】Sam has been appointed _______ manager of the engineering department to take ____ place of George.
B.
the, / C the, the D./, the
【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】已知 是等差数列, 是等比数列,公比 且 ,若 , 则( )