We ----on it for several hours but we have not yet reached a

We ----on it for several hours but we have not yet reached any conclusion
A.work B.are working C.have been working D.have been worked

我是斑斑 1年前已收到4个回答举报

sunanly 幼苗

共回答了19个问题采纳率：100% 举报

C,现在完成进行时,表从过去一直持续到现在,还可能到将来.
for several hours ,for + 段时间,用现在完成时,排除 AB
D 表现在完成时的被动态,与题意不符.
原文意义：我们一直努力了好几个小时,但是至今善未得出任何的结论.
所以选C
）

1年前

123乐一乐幼苗

共回答了22个问题举报

b。现在完成进行时。

1年前

lmyzj20 幼苗

共回答了1个问题举报

选B

1年前

lbj00 幼苗

共回答了163个问题举报

C.have been working
过去完成进行时
表示动作还在继续

1年前

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