By the time you arrive,I'll ( ) working for two hours.
A.be B.have be C.had been D.have been
人气：307 ℃ 时间：2019-10-18 08:37:22
解答
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
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