问题补充:
John and I friends for eight years. We first got to know each other at a Christmas party. But we each other a couple of times before that.
A. had been; have met
B. have been; have met
C. had been; had met
D. have been; had met
答案:
A. had been; have met
B. have been; have met
C. had been; had met
(答案→)D. have been; had met
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