问题
选择题
The Greens must have been to 2010 Shanghai Expo, _____ they?[ ]
A. hadn't
B. didn't
C. can't
D. weren't
答案
答案：D
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The Greens must have been to 2010 Shanghai Expo, _____ they?[ ]
A. hadn't
B. didn't
C. can't
D. weren't
答案：D