—How often do you go to the old people’s
题型：选择题
问题：
—How often do you go to the old people’s house, Tom?
—________.[ ]
A. Once a month
B. In a month
C. After a month
D. For a month
—How often do you go to the old people’s house, Tom?
—________.[ ]
A. Once a month
B. In a month
C. After a month
D. For a month
A、①②③
B、①②④
C、②③④
D、①③④