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题目内容
（大连工业大学-大学英语3）
(单选题) Not until Mr. Smith came to China _____ what kind of country she is from.(本题2.0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
