how many cakes can i have,mom

问题描述:

how many cakes can i have,mom
none,dear.they _______ for your father.
A prepareB prepared
C have prepared D were prepared
如果是d为什么用过去式

D
they指的是cakes所以不能用主动,要被动,这些蛋糕是为你的父亲准备的
过去时是题目时态的问题了,这里只能用被动,所以只能选D,就不管她妈妈是不是在过去给父亲准备的了