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

题目简介

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

题目详情

.
It was ______ the 19th century_____ heat was considered to be a form of energy.
A.not until; thatB.until; that
C.not until; whenD.until; when
题型:单选题难度:偏易来源:不详

答案

A

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