The toddler who miraculously ______ a fall from her 10th-floor home in Hangzhou, east China, ______ recovering quickly.

A．is survived, is

B．are survived, are

C．survived, is

D．being survived, are

Not until his mother came back_______.

A．he began to do his homework

B．had he began to do his homework

C．he had begun to do his homework

D．did he begin to do his homework