事前监督是指监督主体在公安机关及其人民警察实施执法行为之前依法进行监督。 ( )
参考答案：对
The little child usually felt frightened at night, so not until ___________.
A．did he fall asleep his mother left the room
B．he fell asleep had his mother left the room
C．did he fall asleep did his mother leave the room
D．he fell asleep did his mother leave the room
330MW机组快冷装置在机组正常运行时无法试运。（）
