—David, you watch TV all the time. Why not _________ around the house? —Sorry, mum. I will never watch it _________ I

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1. —David, you watch TV all the time. Why not _________ around the house?
—Sorry, mum. I will never watch it _________ I finish doing housework.

A . to help out, as soon as B . to help out, although C . help out, until D . help out, while

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