行为矫正
参考答案：
指依据学习原理处理问题行为，从而引起问题改变的一种客观而系统的有效方法。
— You should have thanked her before you left.
— I meant _____, But when I was leaving I couldn't find her anywhere. [ ]
A. to do
B. to
C. doing
D. doing so
感受器
