Even the top students in our class can't work out this problem, so it be very difficult.
举一反三
- 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
- The math problem isn't difficult, and most of the students can work it out ______.
- This math problem isn’t so difficult that I can work it out ________.
- This Math problem is very difficult. Mary couldn't work out the ______ (solve)
- As a teacher, he has never given his students so difficult a problem ________ they can’t work out.