( )------_____does he help his mother _____housework?------Twice a weekA.How long;of B.How often;with C.How often;doing D.How long;do

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( )------_____does he help his mother _____housework?------Twice a weekA.How long;of B.How often;with C.How often;doing D.How long;do
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( )------_____does he help his mother _____housework?------Twice a weekA.How long;of B.How often;with C.How often;doing D.How long;do
( )------_____does he help his mother _____housework?------Twice a week
A.How long;of B.How often;with C.How often;doing D.How long;do

( )------_____does he help his mother _____housework?------Twice a weekA.How long;of B.How often;with C.How often;doing D.How long;do
选择B
------【How often】does he help his mother 【with】housework?
------Twice a week
他多长时间帮妈妈做一次家务?
一周两次
how often是对频率提问的,“多久一次”“隔多长时间一次”
how long是对时间段提问
help sb do sth=help sb with sth帮某人做
希望能够帮到您

B,
后面回答说两周一次,表示问的是频率,所以排除A, D;
help sb. with sth. 或 help sb. do sth.所以选 B