The girl did some housekeeping for Mrs. Johnson （）her room and board.
A、
for want of
B、
for the sake of
C、
in exchange for
D、
in change for
【正确答案】：C
【题目解析】：
句意：这个女孩替约翰逊太太做家务，以换取她的食宿。in exchange for交换，符合句意。for want of缺乏；for the sake of为了；in change for变化。