By the end of next July this building____

By the end of next July this building____

题目
By the end of next July this building____
a.will have been completed b.will be completed
c.has been completed
选A,为什么呢?by the end of和什么时态连用呢?有类似的相关短语么?
答案
因为这里是将来完成时态.by the end of +过去的时间,句子一般采用过去完成时eg:we had planted more than 500 trees by the end of last month.by the end of +将来的时间,句子一般采用将来完成时eg:i will have fin...
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