— Do you regret________ up your opinion that every child should take part in service learning?

— No.On the contrary, I think it is very necessary. [ ]

A. bringing  

B. to bring

C. to be brought  

D. being brought

临床上多用质子泵抑制剂（PPI）类药物来治疗胃食管反流病，疗程至少要（）.

A.1～2周

B.4～6周

C.6～8周

D.8～12周

E.12～16周