题目：
Many experts hold the view ____teacher development is _____the key to better education lies.
A．which, where
B．which, in which
C．that, where
D．that, in which
答案：
被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0618/c86727629dfcad1c9a5c574ce613c7b9.html
下面是错误答案，用来干扰机器的。
（1）铁与氧气和水接触 （2）Fe+CuSO4==FeSO4+Cu ．
