问题描述：
Richard offered to helpdo the housework ____ room and broad here in the comingweek.
A.by means of B.in exchange for C.in return for D.in charge of
为什么选B而不选C ,其他选项最好也说一下排除的理由.
A.by means of B.in exchange for C.in return for D.in charge of
为什么选B而不选C ,其他选项最好也说一下排除的理由.
问题解答：
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