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题型：单选题题类：真题难易度：普通

____ the damage is done, it will take many years for the farmland to recover.

A、 Until B、Unless C、Once D、Although

举一反三

is even more important is the earth cooled down, water began to appear on its surface.

They had not known each other three days ______ they began to quarrel.

He is writing a book about new discoveries in science. I am sure, _________ it is printed, this book will be very popular.

She was about to tell me the secret ________ someone patted her on the shoulder.

正当医生们面对缺少稀有血一筹莫展时，一个病人家属主动提出了献血。(idea)

_______ acupuncture developed, the simple bian stones were replaced by stone needles.

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