第2题 (2.0) 分 Not until Mr.Smith came to China（） what kind of a country she is.A、did he know
问题描述：
第2题 (2.0) 分 Not until Mr.Smith came to China（） what kind of a country she is.A、did he know
答
Not until Mr. Smith came to China（did he know ） what kind of a country she is.=Mr. Smith didn't know what kind of a country she is until he came to China.
Not until位于句首，主句用半倒装结构，即did he know 。
答
did he know
Not until位于句首,主语用倒装结构