19.The students didn’t manage to work out the problem ______

19.The students didn’t manage to work out the problem ______ The students didn’t manage to work out the problem ______ th The students didn't manage to work outthe problem ______thei 一道英语单选题,I didn't manage to work out the problem( )the teache very few students can work out the problem.the teacher had t 1 Even the top students in our class didn’t work out the pro Both of the students cannot work out the problem means work the problem out This physics problem is__ easy for the students to work out. The twins falied to work out the maths problem 同义句转换：__the t It's ( )to work out this problem .You needn't go to the teac It is_______ to work out this problem .You needn't go to the