Silence falls over the room as the titanic proportions of the de

Silence falls over the room as the titanic proportions of the destruction begin to sink in.
A、When they know the titanic proportions of the destruction, they are silent.
B、When bomb destroy the room, it becomes silent.
C、The titanic destruction shocks everyone in the room, they can't keep silence any more.
D、When the titanic proportions of the destruction begin to weaken, the room becomes silent.
【正确答案】：A
【题目解析】：此题仅仅考查对句意的理解。as在此引导时间状语从句，根据句意，当大面积的废墟开始下沉时，屋里的人都沉默了。只有选项A有此意。答案为A。