Not until Mr.Smith came to China_what kind of country she is.he knewhe didn't knowdid he knowhe couldn't know选出正确答案并给出理由
问题描述：
Not until Mr.Smith came to China_what kind of country she is.
he knew
he didn't know
did he know
he couldn't know
选出正确答案并给出理由
答
答案c
这句话的意思是
直到现在，史密斯先生来到中国,他才知道中国是个什么样的国家。
理由：
前面的Not until是直到……才知道……已是一个否定了
后面就不应用了
而且它又前置，则要did he know这样子表达
答
选he didn't know
句意：直到史密斯先生来了中国,他才知道中国是个怎样的国家.
not until...not...是双重否定,强调语义,如果不...就不...
所以,原意：如果史密斯先生不来中国,他就不知道中国是个怎样的国家.
顺带一句,she指带‘中国’.