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It is not until the disease has progressed to AIDS ____a person begins to look sick.
A.whoB.thatC.whereD.before
B

试题分析:考查强调句型。本题强调的是时间状语从句not until the disease has progressed to AIDS。句意:直到这个病发展为艾滋病的时候,这个人看起来才很虚弱。故B正确。
点评:强调句型的基本结构为It is/was被强调成分that/who其它成分;其最大的特点就是去掉it is/was…that/who…句子仍然成立。要注意强调句型能强调除谓语动词以为的所有的句子成分。在考查的时候,经常会把强调句型和定语从句结合在一起考查,要注意分析句子的成分。
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