题目内容
13．It's five o'clock p．m．Tom and his friends _______in the river．（ ）| A． | swim | B． | are swimming | C． | is swimming | D． | swam |
分析 现在是下午5点．汤姆和他的朋友正在河里游泳．
解答 答案：B．根据题干，本句的意思是现在时下午5点．汤姆和他的朋友正在河里游泳．根据It's five o'clock p．m可知，本句应用现在进行时．现在进行时的结构时候am/is/are doing．又根据Tom and his friends是复数，应用are．故选B．
点评 本题考查现在进行时，做题时应注意题干中暗示的动作发生的时间．
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