问题补充：
—Have you finished your homework yet?
—Not yet. I to do it just a few minutes ago.
A. got down
B. set about
C. set out
D. got on
答案：
A. got down
B. set about
(答案→)C. set out
D. got on
解析：
这题考查词组辨析：A、B、C项都有“开始做某事”的意思，但是get down to doing，set about doing，都不符合，set out 后面接to do，选C。
