it is said that the construction of our new library_____by the end of next year.填什么?had been completed还是

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.

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.