There are about 100 teachers, two thirds of are women.A. themB. whichC. whoD. whom

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A. them
B. which
C. who
(答案→)D. whom
解析：句意：大约有100老师，其中2/3的人是女性。逗号前后都是句子，故缺少连词，先行词是teachers,又是在介词之后所以用宾格的whom，故选D。