语法与词汇
Not until the eighteenth century ____ the complex chemistry of metallurgy.
A、
when scientists began to appreciate
B、
did scientists begin to appreciate
C、
scientists who were beginning to appreciate
D、
the appreciation of scientists began
【正确答案】
B
【答案解析】
答案：B 分析：这是个倒装句。Not until提前，句子倒装。 翻译参考：直到18世纪，科学家才开始认识到冶金学的复杂化学特性
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