问题
选择题
She knows so much about England. She _____ there before.[ ]
A. must be
B. must live
C. must have been
D. must have lived 
in
答案
答案：C
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She knows so much about England. She _____ there before.[ ]
A. must be
B. must live
C. must have been
D. must have lived in
答案：C