You can only be sure of ____ you have at present; you cannot be sure of something ____ you might get

in the future. [ ]

A. that; what

B. what; /

C. which; that

D. /; that

选择性蛋白尿的特点是以

A．清蛋白为主

B．白蛋白为主

C．本-周蛋白为主

D．IgA为主

E．α₂-微球蛋白为主