【題目】—European scientists announced that the speed of light isn’t the speed limit.

—Perhaps it is the biggest challenge to Einstein’s Theory of Relativity. No one ________ any crack in his theory for more than a century.

A. has found B. found C. had found D. would find

【答案】C

【解析】考查動(dòng)詞時(shí)態(tài)。句意：——歐洲科學(xué)家宣布光速不是速度極限�！�也許這是對(duì)愛因斯坦相對(duì)論最大的挑戰(zhàn)，一個(gè)多世紀(jì)以來沒有人發(fā)現(xiàn)他理論中的漏洞。上句中的announced發(fā)生在過去，“一個(gè)多世紀(jì)以來沒有人發(fā)現(xiàn)”是發(fā)生在announced之前，是“過去的過去”，用過去完成時(shí)，故選C。

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