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题目内容
（河南工业大学大学英语）
Not until ten o’clock _____ it was too late to return.(本题1.5分)
A、 they realized
B、 they did realize
C、 did they realize
D、 realized they
A、 they realized
B、 they did realize
C、 did they realize
D、 realized they
参考答案
