Not until Mr. Smith came to China（ ） what kind of a country she is.
A.did he know
B.he knew
C.he didn’t know
D.he could know
正确答案是C
Not until Mr. Smith came to China（ ） what kind of a country she is.
A.did he know
B.he knew
C.he didn’t know
D.he could know
正确答案是C