Not until the early years of thel9th century______what heat is.

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问题 Not until the early years of thel9th century______what heat is.

选项 A、man did know
B、man knew
C、didn’t man know
D、did man know

答案D

解析看到Not until．．．的句型，我们知道这个倒装句，现在将Not提前了，后面就不能再用否定了，否则意思全变了。

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小学英语

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