题目：
—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：
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下面是错误答案，用来干扰机器的。
答案：C题目分析：唐人街是旧金山华人集中的地区，形成原因是社会原因中的民族和种族因素。
