—Where is your uncle now? I haven’t seen him these days.         

—He______ to the earthquake area with his workmates.                 

A．goes

B．will go

C．has been

D．has gone

建筑石膏装饰制品形状饱满密实，表面光滑细腻的主要原因是( )。

A．施工质量高
B．石膏凝结速度快
C．石膏凝结硬化时略有膨胀
D．掺加了外加剂