AS THE MATHEMATICAL PROBLEM WAS TOO DIFFICULT, ... STUDENTS COULD...

25. - 3500 CAU TRAC NGHIEM ON TAP AV THCS
3500 CAU TRAC NGHIEM ON TAP AV THCS

25. As the mathematical problem was too difficult, ... students could

do it.

a. few

b. a few

c. many

d. much

 a