How disappointing it was that I _____   the wonderful football match. [ ]

A. may have missed        

B. should have missed  

C. could have missed      

D. must have missed

可抑制TH2细胞生长的细胞因子是

A．IL-2

B．IFN-γ

C．TGF-β

D．IL-5

E．IL-10