摘要： It is only when the disease has progressed to AIDS that a person begins to look sick. 只有当这种病毒发长成艾滋病时.人才会显出病态. Unit 4 Global warming
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It is only when the disease has progressed to the AIDS ____ a person begins to look sick.
| A．which | B．what | C．who | D．that |
It is only when the disease has progressed to the AIDS ____ a person begins to look sick.
A．which B．what C．who D．that
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