上臂部受伤后出现腕下垂，最可能的是（）

A.锁骨骨折

B.肩关节脱位

C.肱骨干骨折

D.肱骨髁上骨折

E.肱骨颈骨折

一Do you like English?

—Yes, but I think it's _______ subject of all. [ ]

A. the difficult

B. the most difficult

C. more difficult

D. most difficult