By the time Mr.Jackson arrived in Shanghai,he___many famous cities in Europe.选has visited 还是had visited?
问题描述：
By the time Mr.Jackson arrived in Shanghai,he___many famous cities in Europe.
选has visited 还是had visited?
答
你好:由by the time可知，应是had visited
答
had visited
答
had visited
在到达上海之前，Jackson已经去过很多欧洲有名的城市了。
by the time：在....之前已经....（看到by the time，一般主句用过去完成时）
在者，我觉得前面已经是arrived了，那后面肯定不可能跟现在时有关系了，是发生在去上海之前。
答
had visited,因为发生在过去时之前，arrived
答
用had visited,填过去完成时.
根据句意,杰克逊先生到达上海已经发生在过去（因为用的arrived一般过去时）,但在那时,他已经去过欧洲的很多城市了,这发生在过去的过去,所以要再往前推一个时间点,用过去完成时.