There are four ---- and two ---- at the ---- .A.Johns,Marys,doctors B.Johns,Marys,doctor’s C.John’s,Mary’s,doctor’s D.John,Mary,doctor’s 请详解,选正确清楚的为最佳答案.

问题描述:

There are four ---- and two ---- at the ---- .
A.Johns,Marys,doctors B.Johns,Marys,doctor’s C.John’s,Mary’s,doctor’s D.John,Mary,doctor’s
请详解,选正确清楚的为最佳答案.