1 Even the top students in our class didn’t work out the problem . So it be very difficult . A. need B. must C. can’t D. shouldn’t

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1 Even the top students in our class didn’t work out the problem . So it be very difficult .
A. need B. must C. can’t D. shouldn’t

B
这道题一定很难,连班里的尖子生也没能做出来.