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To me, cycling at ___ altitude of more than 4,000 meters was _____ unforgettable experience.
A.the; anB.an; anC./; aD.an; /
:B
:考查冠词。第一空用an泛指在海拔超过4000米的地方。第二空指一次令人难忘的经历,unforgettable是以元音开始的,故用an.句意:对我来说,在海拔4000多米的地方骑自行车是一次令人难忘的经历。故B正确。
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