2. 外语
  3. It was not______many centuries later that the science of map-making was placed on a sound footing.

It was not______many centuries later that the science of map-making was placed on a sound footing.

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问题 It was not______many centuries later that the science of map-making was placed on a sound footing.
选项 A、before
B、after
C、until
D、unless
答案C
解析 It is(was)not until that是一种强调句型，用来强调用until介词短语作状语的句子，意思是“直到……(时)才”。
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