问题
选择题
We saw _____farms which were built more than a hundred years ago.
A．abandoned
B．abandon
C．abandoning
D．to abandon
答案
答案：A
本题中abandon的过去分词abandoned修饰名词farm表示被动的意思，意思为被放弃的农场，故本题选A。
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所示有机物分子核磁共振氢谱有两个峰