When the man came in, gun in hand, we all stood there, ____. [ ]

A. astonished

B. astonishing

C. being astonished

D. having astonished

厕浴间在做好防水之后隐蔽之前，必须要做（）。

A.淋水试验

B.泡水试验

C.强度试验

D.蓄水试验