—WhatwereyoudoingwhenIrangyouthismorning?—Iwasoccupied

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—What were you doing when I rang you this morning?

—I was occupied ________ the housework and kept my soil occupied ________ his homework.

A．at; in doing B．with; in doing

C．al; to do D．with; to do

B　be occupied with sth.和be occupied in doing sth.的意思都是“忙于做某事”。