问题补充：
Not until Mr. Smith came to China what kind of a country she is.
A. did he know
B. he knew
C. he didn know
D. he could know
答案：
(答案→)A. did he know
B. he knew
C. he didn know
D. he could know
解析：考查倒装句：句意：直到斯密斯先生来到中国，他才知道这是什么样的国家。Not until Mr Smith came to China置于句首，主句要部分倒装。助动词did放在主语前面，应该选A。
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