About seven ____(twelve) of these machines wee made in our factory

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About seven ____(twelve) of these machines wee made in our factory
About seven ____(twelve) of these machines wee made in our factory

About seven ____(twelve) of these machines wee made in our factory
应该填twelfth,
整句话的意思是:这些机器中大约有12分之7是我们工厂制造的.
不懂可再询问.