untill the early years of the 19th century did man know what heat is.

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• 第28题 (2.0) 分 Not until the early years of the 19th century（） what heat is.
• untill the early years of the 19th century did man know what heat is.
• 第28题 (2.0) 分 Not until the early years of the 19th century（） what heat is.A、man knew B、didn’t man know C、man did know D、did man know 第29题 (2.0) 分 If we work with a strong will,we can overcome any difficulty,（） great it is.A、what B、how C、however D、whatever 第30题 (2.0) 分 It can take up three months to（） a man to do this work.A、guide B、raise C、train D、learn 第31题 (2.0) 分 “Which of these two ties will you take?” “I’ll take to give me a change sometimes.” A.
• not until the early years of the 19 century ___ what heat is.A.man did know B.man knew C.didn't man know D.did man know请高手为我讲下not until...的用法,not...until我知道怎么用,但是not until...我不清楚,请高手讲下,我将感激不尽,
• untill the early years of the 19th century did man know what heat is.
• [-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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