( )does he call?Once a month A.How seldom B.How long C.How soon D.How often
问题描述：
( )does he call?Once a month A.How seldom B.How long C.How soon D.How often
答
( )does he call? Once a month A.How seldom B.How long C. How soon D.How often
选D
答句是【Once a month】，一月一次
所以问的是频率，所以用【how often】
A没有这种用法
BC问多久
有不会的可以再问我
答
D
对频率提问用how often