UC知道It is said that pencillin _______ by chance in a lab.
来源：百度知道 编辑：UC知道 时间：2024/07/05 09:16:58
A invent B invented C are invented D were invented 想知道该选哪个答案，为什么？
were invented应该是不正确的，因为pencillin是不可数名词，若用的话应该是was invented.
were invented应该是不正确的，因为pencillin是不可数名词，若用的话应该是was invented.
D
were 被发明这件事情发生在过去
invented 因为这里用的是被动语态 Be+done,所以用过去分词invented
D were invented
时态：过去时
语态：被动式
B invented 作后置定语 pencillin与invente是被动关系！
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