Until recently historians assumed that calendars ________ with the advent of agriculture.
A．came to existenceB．came to existing
C．came to existD．were existential
C
考查短語(yǔ)。直到最近，歷史學(xué)家們認(rèn)為日歷隨著農(nóng)業(yè)的出現(xiàn)而存在。come to exist短中to是不定式符號(hào)，后面接動(dòng)詞，故選項(xiàng)AB說法有誤。選項(xiàng)D描述的是過去的一種狀態(tài)，選項(xiàng)C描述的是一個(gè)動(dòng)態(tài)過程。結(jié)合語(yǔ)境可知選C為最佳答案。
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