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
A: may
B: must
C: can
D: need
举一反三
- Even the top students in our class can't work out this problem, so it be very difficult.
- 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 ________.
- As a teacher, he has never given his students so difficult a problem ________ they can’t work out.
- The math problem isn't difficult, and most of the students can work it out ______. A: hardly B: easily C: simply D: impossibly