These early clocks, operated by weights, were not particularly accurate, and it was not until the sixteenth century______.

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问题 These early clocks, operated by weights, were not particularly accurate, and it was not until the sixteenth century______.

选项 A、any great reliability attained it
B、then attained any great reliability
C、that any great reliability was attained
D、when any great reliability attained

答案C

解析 句子大意:早期的这些依靠重量调节而运行的钟表特别不准确,直到十六世纪——。本题旨在考查强调句型“it is+强调部分+that”的用法。句子要表达的意思是“其可靠性才有了显著的改善”,将各选项代入,只有C项符合题意,因此本题选择C。
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