“We can hardly wait to see him” has same meaning as _________.

A．he can ’t be seen by us

B．we can see him

C．it is hard for us to see him

D．we want to see him at once

分子质量最大的免疫球蛋白是()

A．IgG

B．IgA

C．IgD

D．IgE

E．IgM