Not until I began to work ________ how much time I had wasted.
A．didn’t realizeB．did I realizeC．I didn’t realizeD．I realized
B
此題考查的是否定詞放在句首，使用部分倒裝，助動(dòng)詞往前提。not until放在句首從句不倒裝，主句倒裝，然后根據(jù)時(shí)態(tài)選B
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