问题

(福建泉州一中高三期中,34)Only when their children leave home _________.
A:many parents did feel a sense of loss
B:did many parents feel a sense of loss
C:did feel many parents a sense of loss
D:do many parents feel a sense of loss
B:did many parents feel a sense of loss
C:did feel many parents a sense of loss
D:do many parents feel a sense of loss
正确答案是: