单选题 He has been ill with a strange disease lately, ______ I"ve never heard of before.
【正确答案】 D
【答案解析】[解析] 句意：最近他患了一种奇怪的病，这种病我之前从未听说过。one作“一种”理解，用来代替上文提到过的a strange disease，以避免重复。