7.这是not ... until ...结构吗
Notrecently did I have any idea what a guided missile was like.
A. sinceB. whenC. untilD. in
此题答案选C,属not ... until ...句式的一种变体,即将not until ...置于句首,其后用倒装形式。又如:
Not until yesterday did he begin his work.直到昨天他才开始他的工作。
Not until he came back did he realize how serious the matter is.直到他回来,他才意识到问题有多严重。