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问题: 选什么?

This kind of coins ___valuable and these knids of metal_____very rare .
A.is is B. is are C.are are
该选哪个呢?

解答:

This kind of coins ___valuable and these knids of metal_____very rare .
A.is is B. is are C.are are
解析:选B.
这题考察的是数量单位的运用。This kind of coins和these knids of metal分别是前后两句的主语。他们的中心词其实是kind.所以根据kind的单复数决定谓语动词的单复数。
this kind of 译为:这一种的
these kinds of 译为:这些种类的