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题目内容
（桂林理工大学大学英语4）
(单选题)Not until Mr. Smith came to China _____ what kind of country she is from.(本题1.0分)
A.he knew
B.he didn.t know
C.did he know
D.he couldn.t know
A.he knew
B.he didn.t know
C.did he know
D.he couldn.t know
参考答案