— You _______ your drama play very much. I saw you preparing for it excitedly. 　　

— Not really, because of the exam. 　

  [ ]

A. must enjoy　　　

B. must have enjoyed

C. can enjoy 　　　　　　

D. should enjoy

NRDS（新生儿呼吸窘迫综合征）出现呼吸困难的时间是（）

A.生后6小时内

B.生后12小时

C.生后1天

D.生后2天

E.生后3天