问题
选择题
Not until I completed the form that half questions were not relevant to me.
A．had I realized
B．I had realized
C．I realized
D．did I realize
答案
答案：D
选D。考查倒装。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。