there were a fire drill yesterday,那里有错,为什么?

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there were a fire drill yesterday,那里有错,为什么?
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there were a fire drill yesterday,那里有错,为什么?
there were a fire drill yesterday,那里有错,为什么?

there were a fire drill yesterday,那里有错,为什么?
应该把were 改成was
因为后面是a fire drill(单数)
谓语动词也得用单数.