题目内容：

how to find the shortest way to the great lake is a big
how to find the shortest way to the great lake is a big____
matter和thing 还有 problem 填哪一个 为什么?

优质解答

应该是problem.
matter主要是翻译成事情,或指重大事件.
problem往往是一个事情或一个物件存在的问题.