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题型：单选题题类：真题难易度：普通

__ a single word can change the meaning of a sentence, a single sentence can change the meaning of a paragraph.

A、Just as B、Even though C、Until D、Unless

举一反三

If you miss this chance, it may be years ____ you get another one.

He is a shy man，___he is not afraid of anything or anyone.

{#blank#}1{#/blank#}scientists have learned a lot about the universe, there is much we still don't know.

The roof fell _____he had time to dash into the room to save his baby.

{#blank#}1{#/blank#} regular exercise is very important, it's never a good idea to exercise too close to bedtime. (状语从句)

________ gravity holds things together, some unknown ________ is working across the universe to pull everything apart.

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