[-B32] It was not until the early years of the 19th century that _______ what heat was.A.man knew B.did man knew C.didn't man know D.did man know 翻译并分析

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[-B32] It was not until the early years of the 19th century that _______ what heat was.A.man knew B.did man knew C.didn't man know D.did man know 翻译并分析
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[-B32] It was not until the early years of the 19th century that _______ what heat was.A.man knew B.did man knew C.didn't man know D.did man know 翻译并分析
[-B32] It was not until the early years of the 19th century that _______ what heat was.
A.man knew
B.did man knew
C.didn't man know
D.did man know
翻译并分析

[-B32] It was not until the early years of the 19th century that _______ what heat was.A.man knew B.did man knew C.didn't man know D.did man know 翻译并分析
人们直到十九世纪初期才知道暖气是什么.
因为前面有了一个that,后面要加完整句子,后面的选项只适用于没有that的情况下.
如果没有that,那么not until 后面要谓语前置,而直到才,not until .did .do 则应该选D

人们一直到十九世纪初叶,才明白热量的真相。

直到19世纪初期,人们才知道什么是热量

直到19世纪早期,人们才知道热度是什么。
that后面接的是宾语从句,从句正常的结构应该是主语加谓语。除了A是这种正常语序,其他以DID开头的语序都是不对的。

A
解析:强调“not...unti...”引导的时间状语时,要用it is /was not until ...that ...的结构,that 后面的句子要用肯定式,且用陈述语述。所以选择A
翻译:直到19世纪早期,人们才知道什么是热