Mike did the homework it took me.
A. one-third a time
B. one-third the time
C. a one-third time
D. one-third time
网友回答
A. one-third a time
(答案→)B. one-third the time
C. a one-third time
D. one-third time
解析：考查倍数的表达：用的是“倍数+the+名词”的结构，倍数是one-third+the+名词（time），句意：迈克做作业的时间是我的三分之一。选B。