without his wise mother,he ____ such a successful scientist.a.would not become b.could not have become为什么选第二个,第一个不行吗?

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without his wise mother,he ____ such a successful scientist.a.would not become b.could not have become为什么选第二个,第一个不行吗?

without his wise mother,he ____ such a successful scientist.a.would not become b.could not have become为什么选第二个,第一个不行吗?
without his wise mother,he ____ such a successful scientist.
a.would not become b.could not have become
为什么选第二个,第一个不行吗?

without his wise mother,he ____ such a successful scientist.a.would not become b.could not have become为什么选第二个,第一个不行吗?
这是个“虚拟语气”的句子,表示“与现在与过去事实相反”的意义,所以,谓语动词要用 would/ could + have + 过去分词.所以,选择 B,即 第二个 答案..
意思是:如果没有位聪明的妈妈,他是不会成为一位成功的科学家的.

你可以这样理解,根据句意:没有他那英明的母亲,他不可能成为这么成功的科学家。
怎么翻译都是完成时...

正确答案是第一个。
也不好和你解释,很多语法术语都忘了。如果不是她的妈妈,是指过去;他不会成为如此成功的科学家,是指现在他是科学家,故虚拟语气用过去时。