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Not until ___to do my homework ____ how much time I had wasted playing computer games.
A.I began; I realized
B.I began; did I realize
C.did I begin; I realized
D.did I begin; did I realize
B
考察倒装句。Not until放在句首时,后面的状语从句不要倒装,但是后面的主句应该使用部分倒装的形式。故B正确。
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