专四

单选题_________填上最佳答案。

A．haveoriginated
B．beoriginating
C．beoriginated
D．originate

参考答案：A进入在线模考
originate表“起源”是不及物动同，不能用于被动，因此先排除C。而根据上下文“起源于很久以前”，是始于过去，对现在有影响的事件，因此应该选择不定式的完成体，故选A．have originated。
【点睛】语法线索题。四个选择均是同一个词的不同形式．此时语法知识是解题荚键。

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