_________ last as his coach suggested, he wouldn’t have narrowly escaped being killed.

A．Hadn’t the skydiver exited

B．If the skydiver hadn’t exited

C．Should the skydiver not exit

D．If the skydiver wouldn’t exit

通过贸易、生产、来料加工、代繁、科研、交换、展览、援助、赠送等各种方式进境的植物繁殖材料须事先办理检疫审批手续，但享有外交、领事特权与豁免权的外国机构的进境植物繁殖材料除外。( )