Not until the early years of the 19th century______what heat is.A、man knewB、did

游客2025-07-31 12

问题 Not until the early years of the 19th century______what heat is.

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

答案 B

解析 Not until置前，句子要倒装。

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Notuntiltheearlyyearsofthe19thcentury______whatheatis.A、manknewB、did