问题
选择题
How long you ?
-I swam for half an hour. [ ]
A. have；been swimming
B. have；swum
C. do；swim
D. did；swim
答案
答案：D
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How long you ?
-I swam for half an hour. [ ]
A. have；been swimming
B. have；swum
C. do；swim
D. did；swim
答案：D