Not until Mr. Smith came to China _____ what kind of country she is from.(本题1.5分) A、 he knew B、 he didn.t know C、 did he know D、 he couldn.t know

Not until Mr. Smith came to China _____ what kind of country she is from.(本题1.5分)
A、 he knew
B、 he didn.t know
C、 did he know
D、 he couldn.t know

出自：商丘师范学院-英语口语(高起专)

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