题干
—— ______you _____ out the problem, Sam?
——Not yet, but I'm going to.
A：Did, work
B：Are, working
C：Have, worked
D：Will , work
答案(点此获取答案解析）
C
—— ______you _____ out the problem, Sam?
——Not yet, but I'm going to.
A：Did, work
B：Are, working
C：Have, worked
D：Will , work
