主要Ig的特性和功能中,“血清Ig升高说明有近期感染”属于()
A.IgG
B.IgM
C.IgA
D.IgD
E.IgE
参考答案:B
Ben ___ _ breakfast every day. [ ]
A. have to
B. has to
C. has to have
D. has to has