—How often does your sister surf the internet?—About.A. three timeB. three timesC. three t

问题补充：

—How often does your sister surf the internet?

—About.

A. three time

B. three times

C. three time every day

D. three times a day

答案：

A. three time

B. three times

C. three time every day

(答案→)D. three times a day

解析：How often 多久一次，句意：你的姐姐多久上一次网？ 大约一天三次。故选D。