he help his parents____the hosework用in,on,with还是at

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hehelphisparents____thehosework用in,on,with还是athehelphisparents____thehosework用in,on,with还是athehelphi

he help his parents____the hosework用in,on,with还是at
he help his parents____the hosework
用in,on,with还是at

he help his parents____the hosework用in,on,with还是at
with ^^

if是如果的意思 as是因为的意思 unless是除非的意思 when是当的意思这句话的意思是“鲍勃没有承诺在参加足球比赛,因为他帮助他的父母在农场”所以选B .