The children talked so loudly at dinner table that I had to struggle         .[ ]

A. to be heard    

B. to have heard    

C. hearing    

D. being heard

男，30岁，胫骨骨折伤后半年骨仍未连接，诊断骨不连的最主要的依据是（）

A.骨质疏松

B.骨折端吸收、硬化

C.骨折端对位线不好

D.骨折线尚可见

E.连续观察2周骨折处不变形