可出现咯血，胸片见两肺散在棉球状阴影（）
A.绒癌
B.良性葡萄胎
C.侵袭性葡萄胎
D.绒癌+侵袭性葡萄胎
E.胎盘部位滋养细胞肿瘤
参考答案：D
All the photographs in this book, ________ stated otherwise, date from the 1950s. [ ]
A. unless
B. until
C. once
D. if
路堤
