题目内容
15．---I hear Mr．Black has gone to Beijing．---Really？Do you know when he ？（ ）
| A． | leaves | B． | left | C． | has left | D． | is leaving |
分析 我听说Black先生已经去北京了．--真的吗？你知道他什么时候离开的吗？
解答 答案：B 根据"Mr．Black has gone to Beijing．"可知Black先生已经离开了，离开这一动作发生在过去，应该用一般过去时（动词用过去式）．A为一般现在时；B为一般过去时；C为现在完成时；D为现在进行时．故选B．
点评 本题考查一般过去时．判断动作发生的时间，是做题的关键．
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