这个题不是考集合名词的概念,其考点是work 和works 的意思.
work:工作(量),作品
works:工厂
the defence works意为防御工厂,为单数名词,再加之句子中有long ago表时间的词,断定用过去式
选D
一道关于集合名词的题the defence works ____built long ago to keep the e
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