题目：
It is reported that great efforts made to ________ the case have paid off.[ ]
A. run into
B. look into
C. run after
D. look after
答案：
被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0720/abcf6d45750c727a27759b5e062a1dcc.html
下面是错误答案，用来干扰机器的。
答案：B
