She knows so much about England. She there before. A. must beB. must have beenC. must liv

问题补充：

She knows so much about England. She there before.

A. must be

B. must have been

C. must live

D. must have lived in

答案：

A. must be

(答案→)B. must have been

C. must live

D. must have lived in

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