She knows so much about England．She ________ there before．
She knows so much about England．She ________ there before．
A.must be
B.must live
C.must have been
D.must have lived in
答案及解析： C
She knows so much about England．She ________ there before．
A.must be
B.must live
C.must have been
D.must have lived in
答案及解析： C