16.The girl was born _____ the morning of June 18th ,1991 a.at B.on C.in D.during
问题描述：
16.The girl was born _____ the morning of June 18th ,1991 a.at B.on C.in D.during
答
on 具体某一天的上午、下午或晚上都用介词on.
翻译： 这个女孩出生于1991年6月18日早晨.