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

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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
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

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
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)

B,must
根据上问,即使是尖子生都做不出,想必这道题一定是很难
must be,情态动词表肯定的推测

must be
表示肯定的猜测