by the time he arrives in beijing,we_here for two days.a.have stayedb.will have stayed为什么选b

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bythetimehearrivesinbeijing,we_herefortwodays.a.havestayedb.willhavestayed为什么选bbythetimehearrivesinb

by the time he arrives in beijing,we_here for two days.a.have stayedb.will have stayed为什么选b
by the time he arrives in beijing,we_here for two days.
a.have stayed
b.will have stayed
为什么选b

by the time he arrives in beijing,we_here for two days.a.have stayedb.will have stayed为什么选b
by the time,要用将来完成时