it is said that the construction of our new library_____by the end of next year.填什么?had been completed还是will have been completed.
问题描述：
it is said that the construction of our new library_____by the end of next year.填什么?had been completed还是
will have been completed.
答
填will have been completed.
原因是：最后的时间短语by the end of next year,它的意思是：在明年年末之前
暗示：这里改用将来完成时态.