How long does your mother usually spend ()a big dinner?c.preparing for d.preparing为什么呢

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How long does your mother usually spend ()a big dinner?c.preparing for d.preparing为什么呢
How long does your mother usually spend ()a big dinner?
c.preparing for d.preparing
为什么呢

How long does your mother usually spend ()a big dinner?c.preparing for d.preparing为什么呢
prepare sth 准备什么东西
这是固定词组,不加for的,具体可以查阅高考必备或朗文

spend doing sth
preparing 是及物动词,可直接跟宾语,加for是表示为某事准备什么

Spend doing 中省略一个in prepare意为准备 与题意相符

D. 及物.