Since the 14th and 15th centuries,tjhe Diaoyu Islands ______

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Since the 14th and 15th centuries,tjhe Diaoyu Islands ________ in Chinese maps.
A.have been included B.had been included C.were included D.would be included
为什么选择A不是B呢

你好：Since the 14th and 15th centuries, the Diaoyu Islands have been included in Chinese maps.
自十四十五世纪以来,钓鱼岛一直就是中国的领土（在中国的地图上）.
分析如下：
（1）先弄明白什么是过去完成时.过去完成时表示过去的过去,即有一个过去的时间点,在这个点之前的动作就用过去完成时.本句the Diaoyu Islands have been included in Chinese maps动作发生在前一个时间点的后面,所以用现在完成时.下面是一个过去完成时的例子,一般以时间状语从句的形式出现：Before I went home, he had finished his homework.
（2）常见的现在完成时的时间状语有：for+一段时间（如a week, a year等), before,already, since+时间点（如last week, 2010, the 15th century等),当然还有其他一些词.
希望对你有所帮助.

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