sat语法题For years historians claimed that pasta A(was introduc

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sat语法题
For years historians claimed that pasta A(was introduced) to Europe B(around) 1295; C(however),archaeologists have uncovered D(what appears to be) pasta-making devices that date back even earlier.E(No error)
这个题选D。求原因。

这句话是过去时, D选项 appears 是一般现在时所以错
再问：前边是have uncovered啊。
再答：好吧、、就算他是现在时，后面那个是pasta-making devices 是复数不应该用appears

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