.It was the 19th century heat was considered to be a form of energy.A. not until; thatB.

发布时间：2020-08-16 09:33:45

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It was      the 19th century     heat was considered to be a form of energy.
A. not until; that
B. until; that
C. not until; when
D. until; when

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(答案→)A. not until; that
B. until; that
C. not until; when
D. until; when
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