Is there life on the other planets?

Is there life on the other planets?
Scientists agree there_____be,but that it would possibly be different from ours because different planets have different environment.A.could B.will C.shall D.had 为什么?

yiyi-1203 1年前已收到4个回答举报

eagle0204 幼苗

共回答了19个问题采纳率：78.9% 举报

could－可以,表示可能,和后边的would不配套.
will－将,表示将来,不能肯定的事哪能用将来说?逻辑不符.
shall－应该,配would
had,没听说过有had be这种用法,had been、have to be还可能.

1年前

陈家的希望幼苗

共回答了139个问题举报

我觉得should更好。呵呵

1年前

爱在淋雨幼苗

共回答了86个问题举报

因为为空格后边是be 如果用had应该是been 所以D排除
连词but应该连接两个时态相同的句子所以B 排除 would是会的意思，而不是will的过去时
从意思上理解应该为这里应该是有一些生物的但是与我们这里的不同前半句有让步的意思而could不能表示让步的意思...

1年前

nnxujian 幼苗

共回答了11个问题举报

从情态动词和虚拟语气的角度来看，没有很合适的选项，一定要选，个人认为A更合适！我做题目不会只看A B C D 很多时候给出的题目答案也值得商榷！

1年前

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