Question

even the top students in our class

Even the top students in our class can't work out this problem.So it be very difficult.May B must
选a是B

Answer 1

B
题意：这道题目甚至连我们班级里最顶尖的学生也做不出来.因此这道题目（一定）是非常困难的.
表示肯定的判断,用must
如果是可能的不确定的推断,用may（可能）