It is only when the disease has progressed to the AIDS ____ a person begins to look sick.
A．whichB．whatC．whoD．that
D

試題分析：句意：只有當(dāng)疾病發(fā)展成艾滋病時，一個人看起來才像是病人。這里是強(qiáng)調(diào)句型，其結(jié)構(gòu)是It was+被強(qiáng)調(diào)部分+ that+其他，判斷強(qiáng)調(diào)句型的方法是把It was that去掉整個句子不缺成分，是成立的。這里強(qiáng)調(diào)的是時間狀語從句，故用that。
點評：本題難度適中。強(qiáng)調(diào)句型是高中階段的重難點之一，也是高考的熱點，需要考生有分析理解句子的結(jié)構(gòu)的能力。近幾年高考把強(qiáng)調(diào)句型與其他從句混合在一起考查更增加了試題的難度。
即學(xué)即練：It was not until midnight____they reached the camp site.
A. that    B.when   C.while   D. as
解析：A。句意：該題強(qiáng)干擾項是B，考生容易因強(qiáng)調(diào)時間狀語until midnight而誤選。
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