( ).____ do you write to your pen pal?Once a month.A.How B .How often C.How much D.How long
问题描述：
( ).____ do you write to your pen pal?Once a month.A.How B .How often C.How much D.How long
答
答案：B
根据答语“一个月一次”,前面应该是询问频率的,用how often.