Here _____ the great photos of her family. [ ]
A. are
B. is
C. am
D. be
答案:A
继发性拔牙后出血是因为()
A.肉芽组织残片
B.软组织撕裂
C.牙槽骨骨折
D.创口感染
E.拔牙创内小血管破裂
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