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By the time Jane gets home,her aunt____for London to attend

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By the time Jane gets home,her aunt____for London to attend a meeting.
a.will leave
b.leaves
c.will have left
d.left
想知道为什么,还有B怎么不行
By the time Jane gets home,her aunt____for London to attend a meeting.
a.will leave
b.leaves
c.will have left
d.left
题目的意思是,“到Jane到家的时候,她阿姨就会前往伦敦去参加一个会议”这个句子当中,By the time后面没有用完成时态,说明Jane回家这个动作还没有发生,所以后面的leave for也应该是将来的某个时间才会产生的某种结果,所以用将来完成时will have left.
主要要理解句子的语境.