—When were you born(出生)?
—I was born ______ July 6th,1992.
A．in B．at C．on D．of
—When were you born(出生)?
—I was born ______ July 6th,1992.
A．in B．at C．on D．of
答案：C 点拨：考查介词。在具体的“某年某月某日”需用介词on。故选C项。