Even the top students in our class can′t work out this problem, so it ________ be very difficult.
Even the top students in our class can′t work out this problem, so it ________ be very difficult.
A、may
B、must
C、can
D、need
【正确答案】：B
【题目解析】：句意：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
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