—When will the party be held?

— ______ two weeks' time, _____ 15th July. [ ]

A. In; on

B. In; in

C. On; on

D. At; on

凡屋面防水层采用细石混凝凝土、防水砂浆等材料做成的，称为刚性防水层，把屋面形成一个整体。