Not until I ________ to work ____ how much time I had wasted.
A．did begin; didn’t I realizeB．began; I realized
C．did begin; I realizedD．began; did I realize
D
本題考查倒裝句。否定詞Not until位于句首，主語要用部分倒裝，但從句不倒裝。句意：直到我開始工作我才意識(shí)到我浪費(fèi)了多少工作。根據(jù)語境應(yīng)用過去式，所以選D
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