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

試題分析：考查強(qiáng)調(diào)句型。本題強(qiáng)調(diào)的是時(shí)間狀語(yǔ)從句not until the disease has progressed to AIDS。句意：直到這個(gè)病發(fā)展為艾滋病的時(shí)候，這個(gè)人看起來(lái)才很虛弱。故B正確。
點(diǎn)評(píng)：強(qiáng)調(diào)句型的基本結(jié)構(gòu)為It is/was被強(qiáng)調(diào)成分that/who其它成分；其最大的特點(diǎn)就是去掉it is/was…that/who…句子仍然成立。要注意強(qiáng)調(diào)句型能強(qiáng)調(diào)除謂語(yǔ)動(dòng)詞以為的所有的句子成分。在考查的時(shí)候，經(jīng)常會(huì)把強(qiáng)調(diào)句型和定語(yǔ)從句結(jié)合在一起考查，要注意分析句子的成分。
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