the teacher could not make himself --- attention to because

the teacher could not make himself ___ attention to because the students were so noisy.
a.pay
b.paid
答案当然选b.这属于一个明显的make oneself +_done 结构,make 作谓语,himself 作宾语,paid attention to 即过去分词表被动作宾语补足语,（注意这里的to千万不能去掉）.