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

B 【解析】句意:甚至我班里最好的學(xué)生都做不出來這個題,因此它一定很難。A. may也許;B. must 一定;表示推測時一般用于肯定句中,語氣較肯定,較有把握; C. can可能,表示推測時,往往用于否定句或疑問句;D. need需要。根據(jù)Even the top students in our class can't work out this problem最好的學(xué)生做不出來的題,應(yīng)該...
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