21. Not until the early years of the 19th century ______ what heat is.
(A) man did know
(B) did man know
(C) didn’t man know
(D) man knew
詳解 (共 2 筆)
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Mendidn'tknow what h...
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例句：Not until I came ...
私人筆記 (共 2 筆)
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Not until the early ...
未解鎖
Man didn't know what...
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