Little _______ that we were watching his every move, so he seemed to be going his own way in this business.
A.he realized
B.he didn't realize
C.didn't he realize
D.did he realize
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D解析思路分析：little为表示否定含义的副词，位于句首时，它所在的句子采用部分倒装语序，故A、B项不对。C为否定含义，故也不对。只能选D项。
点评：该题考查倒装，难度适中。表示否定含义副词除little外，常见的还有never, hardly, seldom, scarcely, rarely, nowhere, not等。它们位于句首时，所在的句子都用部分倒装。