【題目】The custom________the 8th century when people knew little about the earth where they lived.
A.dates back to
B.is dated to
C.is dated from
D.dates to

【答案】A
【解析】date back to/date from表示“始于；追溯到”，不用被動語態(tài)，常用一般現(xiàn)在時(shí)態(tài)。本句意為“這種習(xí)俗始于八世紀(jì)，當(dāng)時(shí)人們對于他們所居住的地球并不了解。”

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