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倒装句练习
1. Not until the early years of the 19th century______ what heat is.
A. man did know B. man knew C. didn’t man know D. did man know
2. Not until I began to work ______how much time I had wasted.
A. didn’t I realize B. did I realize C. I didn’t realize D. I realized
3. ---Do you know Jim quarreled with his brother? --- I don’t know, ______.
