1. 答案： (B) did we realize 解析： 這句話使用了 倒裝句，因為 "Not until..." 這類開頭的從句會導致主句使用部分倒裝（助動詞提前）。 一般語序：We did not realize how serious the budget deficit had become until the final report. 倒裝語序：Not until the final report did we realize how serious the budget deficit had become.