Question

( )------_____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

Answer 1

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

Answer 2

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

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谢谢