—What were you doing when I rang you this morning?—I was occupied the housework and kept

问题补充：

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

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

A. at；doing

B. with；doing

C. at；to do

D. with；to do

答案：

A. at；doing

(答案→)B. with；doing

C. at；to do

D. with；to do

解析：be occupied with sth.和be occupied (in) doing sth.的意思都是“忙于做某事”。