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
考察倒裝句。Not until放在句首時，后面的狀語從句不要倒裝，但是后面的主句應該使用部分倒裝的形式。故B正確。
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