it is estimated that by the end of the month 100people____ a

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it is estimated that by the end of the month 100people____ and 4200 left homeless
A had been killed
B would have been killed
答案为A 求解释
by the end此句后面不是应该用B 吗

y the end of last/ the month,句子用过去完成时,例如：By the end of last month our factory had successfully carried out its production plan for this year.到上月底,我们工厂已胜利完成了今年的生产计划.
by the end of this month,句子则用现在完成时,例如：It's reported that by the end of this month the output of TV sets in this factory will have risen by about 10%
再问： by the end of last month 是上个月底 by the end of the month是翻译什么意思？ by the end of this month 是到这个月月底意思？所以用将来完成时？
再答： by the end of this month 是到这个月月底那就是还没有到当来用将来时，所以结合by。。。就是用将来完成时 by the end of the month 就是到月底的意思

it is estimated that by the end of the month 100people____ a it is estimated that by the end of the month 100 people ____ It’s reported that by the end of last month the sale of the It's reported that by the end of this month the output of TV It is estimated that by 2010 50% of the world's population w If the work by the end of this month is . He said that he_reading the book by the end of that month. It is necessary that he _______ the task by the end of next it's necessary that he___ the task by the end of next week.A if the project （） by the end of this month is delayed ,the 改错题、If the work completed by the end of the month is delayed it is expected that the building____completed by nexy month.