This kind of exercise is most _____, and
题型:选择题
问题:
This kind of exercise is most _____, and therefore is a good test of you students' ability. [ ]
A. surprising
B. encouraging
C. exciting
D. challenging
This kind of exercise is most _____, and therefore is a good test of you students' ability. [ ]
A. surprising
B. encouraging
C. exciting
D. challenging