问题补充：
--- What when I phoned you?
--- I my work, and I was about to go out．
A. have you done; finished
B. were you doing; have finished
C. did you do; had just finished
D. were you doing; had just finished
答案：
A. have you done; finished
B. were you doing; have finished
C. did you do; had just finished
(答案→)D. were you doing; had just finished
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