问题
选择题
—Do you still write to your friends these days?
—No, but I used ______ that when I was at school. [ ]
A. do
B. did
C. done
D. to do
答案
答案：D
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—Do you still write to your friends these days?
—No, but I used ______ that when I was at school. [ ]
A. do
B. did
C. done
D. to do
答案：D