A occupied
本是be occupied in/with"忙于,沉浸于"
因为有逗号,这里做伴随状语
还原为The mother is occupied in the kitchen
g该句也可改为定语从句,即The mother who is occupied in the kitchen , totally forgot the medicine on the table within the child's reach.
B 有表将来的意思;C与主语mother不是主谓关系,而是be occupied in(有被动意味)D语法错误,也没有"正在被"的意思
A
已经是形容词了,忙;被占用;没空
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