问题补充：
---- It is the second time that I to Shanghai.
----- What great changes! It’s ten years since I there last time.
A. have been; went
B. had been; went
C. am; had been
D. come; had been
答案：
(答案→)A. have been; went
B. had been; went
C. am; had been
D. come; had been
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