No matter how hard he tried, he couldn't ( ) of what the old w

No matter how hard he tried, he couldn't ( ) of what the old woman said.
A、work out
B、make sense
C、make sure
D、figure out
【正确答案】：B
【题目解析】：make sense of 摸清..意思，句子含义为无论他怎么努力，他仍然不能理解老妇的意思。