问题补充:
He could have finished it on , but he was ill last week and that was why he fell behind.
A. schedule
B. disadvantage
C. purpose
D. timetable
答案:
(答案→)A. schedule
B. disadvantage
C. purpose
D. timetable
解析:词义辨析。A. 时间表 B.缺点 C.目的 D. 时间表;课程表。句意:他本能按时完成,但是上周他生病了,那是他为什么落后了。短语on schedule,按时,故选A。