—does he go shopping? — Twice a week.A. How often B. How C. How long

问题补充：

—does he go shopping? — Twice a week.

A. How often B. How C. How long

答案：

解析：

试题分析: 句意：他多久购物一次？一周两次。How often多久一次，How如何，how long多久；根据Twice a week一周两次，可知对频率进行提问，故选A。