问题
选择题
It _____ Jack twenty minutes _____ the math problem yesterday. [ ]
A. took, to work out
B. takes, to work out
C. has taken, working out
D. is taking, working
答案
答案:A
It _____ Jack twenty minutes _____ the math problem yesterday. [ ]
A. took, to work out
B. takes, to work out
C. has taken, working out
D. is taking, working
答案:A