The visiting professor asked the students they found most difficuit in learning English.A.whether B.where C.what D.how在they前面有一个空格。我知道选什么但该如何解释，明天轮到我来讲课
问题描述：
The visiting professor asked the students they found most difficuit in learning English.
A.whether B.where C.what D.how
在they前面有一个空格。我知道选什么但该如何解释，明天轮到我来讲课
答