The roof began to fall she had time to dash into the room to save her baby.A. afterB. asC

问题补充：

The roof began to fall she had time to dash into the room to save her baby.

A. after

B. as

C. before

D. until

答案：

A. after

B. as

(答案→)C. before

D. until

解析：考查连词。A. 在……之后 B. 当……时 C. 在……之前 D. 直到……。句意：在她还没来得及冲进房间去救她的婴儿前，房顶就开始下降。选C。