17.the baby fell asleep the room.A.After；did the mother leave B.Not until；did the mother
问题描述：
17.the baby fell asleep the room.A.After；did the mother leave B.Not until；did the mother
17.the baby fell asleep the room.
A.After；did the mother leave
B.Not until；did the mother leave
C.Not until；the mother left
D.Soon after；the mother had left
答
B.
not until用在句首,句子主谓要倒装.正常语序是The mother did not leave the room until the baby fell asleep,为了表示强调而把后半部分提到了前面.