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题目
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A man does not know the difficulty of anything_________ he does it personally.
A.althoughB.ifC.becauseD.unless

答案
D
解析
连词unless本身具有否定意义:i£..not,引导的是否定的条件句,这种否定的条件句从反面来强调的语气,一些语法学家称它为“反面的惟一条件句”,如: One cannot master a foreign language well unless he studies it hard.
核心考点
试题【A man does not know the difficulty of anything_________ he does it personally.A.】;主要考察你对连词等知识点的理解。[详细]
举一反三
This coat will lose its color ___________ it"s washed.
A.asB.afterC.untilD.while

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A.Now thatB.AfterC.AlthoughD.As soon as

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__________ you understand the rule, you will have no further difficulty.
A.WhileB.OnceC.ThoughD.Unless

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Mary is short__________ her brother is very tall.
A.stillB.norC.whileD.when

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--Shall Mary come and play computer games?
--No,__________ she has finished her homework.
A.whenB.ifC.unlessD.once

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