By the time you arrive,I'll ( ) working for two hours.A.be B.have be C.had been D.have been

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By the time you arrive,I'll ( ) working for two hours.A.be B.have be C.had been D.have been
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By the time you arrive,I'll ( ) working for two hours.A.be B.have be C.had been D.have been
By the time you arrive,I'll ( ) working for two hours.
A.be B.have be C.had been D.have been

By the time you arrive,I'll ( ) working for two hours.A.be B.have be C.had been D.have been
D.
1,will 后面接动词原形.排除C
2,have 与 v-ed分词 连用构成现在完成时.没有have be这种时态,排除B
3,for + 时间段与现在完成时连用,排除A,因此选D

D.
翻译为:等你到的时候,我已经工作2个小时了

D....
到你来的时候,我会工作将近两个小时了。。。
将来完成时。。。