问题补充：
—I thought you wouldn’t mind.
—Well, as a matter of fact I ; but you should have asked me first.
A. did
B. do
C. won’t
D. don’t
答案：
A. did
B. do
C. won’t
(答案→)D. don’t
解析：省略句。As a matter of fact, I don’t mind. 从but…应看出用否定
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