I had been working on math for the whole afternoon and the numbers        before my eyes.

A．swim

B．swum

C．swam

D．had swum

股份有限公司的创立大会必须有代表股份总数( )以上的发起人、认股人出席才能举行。

A．1/2

B．2/3

C．3/4

D．4/5