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【单选题】
关于妊娠滋养细胞肿瘤，下列哪项正确A.
侵蚀性葡萄胎可以发生在流产后
B.
绒毛膜癌可以发生在葡萄胎之后
C.
前次妊娠为异位妊娠，不发生绒毛膜癌
D.
绒毛膜癌最早出现的是脑转移
E.
绝经后再不发生绒毛膜癌
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