Not until I began to work ____ how much time I had wasted.
A．didn’t I realizeB．did I realize C．I didn’t realizeD．I realized
B
本題考查倒裝結(jié)構(gòu)。not until引導(dǎo)狀語從句位于句首時(shí)，主句要倒裝，故選B。句意：直到我開始工作我才意識(shí)到我已經(jīng)浪費(fèi)了多少時(shí)間。
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