【单选题】How about going to the cinema with me tonight? ---I’ll ask my parents if they ____ me go.
【单选题】I’ll ask my parents _________.
A.
whether they will agree to go
C.
if they will let me go
D.
whether they allow me to
【单选题】()是除去病原体中无免疫保护作用的有害成分,保留其有效的免疫原成分制成的疫苗
【单选题】除去病原体中无免疫保护作用的有害成分,保留其有效的免疫原成分制成的疫苗是