【题目】Not until I completed the form that half the questions were not relevant to me.
A.had 1 realized
B.I had realized
C.I realized
D.did I realize

【答案】D
【解析】句意：直到我完成了表格我才意识到一半的问题与我不相关。含有否定意义的词never, seldom, little, hardly, not, scarcely, nowhere, by no means等置于句首时, 句子使用部分倒装语序, 故选D。A项时态错误, 故被排除。