题目内容

____time,Chinese farmers have invented many farming techniques.
A．OverB．InC．OnD．For
A

试题分析：考查介词：over time，经过一段时间，句意：经过一段时间中国农民发明了很多农具。In time及时，on time准时，都不符合句意。选A。
点评：介词的考查首先是记住介词本身的含义，再就是介词的搭配，还有结合上下文句意做题。
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