题目内容
15．Look!Some visitors _______ for the bus over there．（ ）| A． | are waiting | B． | is waiting | C． | waiting | D． | wait |
分析 看！一些参观者正在那边等车．
解答 答案：A 根据提示词look 可知，此句表示动作正在进行，所以用现在进行时态；现在进行时态结构形式为助动词be+v．ing；又因为主语Some visitors 是复数形式，助动词用are．故选A．
点评 判断动词的时态，要通过所给的时间状语、提示词或语境去判断动词存在的状态．
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