问题
选择题
E-mail is very popular today. People hardly post letters, ________? [ ]
A. did they
B. do they
C. didn't they
D. don't they
答案
答案：B
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E-mail is very popular today. People hardly post letters, ________? [ ]
A. did they
B. do they
C. didn't they
D. don't they
答案：B