He described where they____________ and told how they________across

the United States.  [ ]

A. landed ;  moved  

B. land ;  move  

C. had landed; were moving  

D. have landed; are moving

患者男性，20岁。2年前曾因外力撞击腰部致腰痛，经外用中药后好转；半年前出现夜间腰痛，起床活动后好转，腰痛无向下肢放射，口服止痛药无好转。X线检查提示双侧骶髂关节炎。患者最可能的诊断是（）

A.腰椎劳损

B.坐骨神经痛

C.强直性脊柱炎

D.骨关节炎

E.类风湿关节炎