下列哪个激素的主要作中是保钠排钾

A．皮质醇

B．雌二醇

C．孕酮

D．醛固酮

E．甲状腺激素

If your mother were here, she ______ allow you to surf the Internet for so long.

A．won’t

B．doesn’t

C．didn’t

D．wouldn’t