36. --- I don’t know whether I should accept the invitation to join Microsoft or get my master degree first.

---- Don’t hesitate _______ will you get such an opportunity.

A．and never again

B．or never again

C．and where

D．or where

防水工程按工程部位可分为（）。

A.屋面防水

B.地下防水

C.卫生间防水

D.柔性防水

E.刚性自防水