A. man did know B. man know C. didnt man know D. did man know
答案D. 看到Not until的句型,我们知道为一倒装句,答案在C,D 中选一个。
改写为正常语序为,Man did not know what heat is until the early years of the 19th. 现在将not提前,后面就不能再用否定了,否则意思就变了。
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2016-02-29
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