帮忙解决一道单选

prepare

vt.
1. 准备;使...准备好[(+for)][O2]
They prepared themselves for the worst.
他们作了最坏的打算。
2. 筹备,筹划[(+for)]
3. 做(饭菜);制作;调制[O1]
When we arrived home, mother had already prepared dinner for us.
当我们到家时,母亲已为我们准备好了晚餐。
4. 起草;编纂
vi.
1. 准备,预备[(+for)][+to-v]
I was preparing for bed when I heard a knock at the door.
我正准备睡觉时听到有人敲门。

翻译:
个人意见：这是强调句，what the pupils do in their spare time是名词性从句作主语，谓语应为单数 prepares 而不是prepare

学生在闲暇时间的所作所为的确为他们将来长大在社会立足做了准备。

谢谢

prepare to
准备

对

=are you readly