问题补充：
-----Is this the first time you Chengdu ?
-----No. But the first time I here, the city wasn’t so beautiful.
A. visited, came
B. visited, have come
C. have visited, have come
D. have visited, came
答案：
A. visited, came
B. visited, have come
C. have visited, have come
(答案→)D. have visited, came
解析：考察固定句式的时态。本题第一空是固定句式It /That/This is the...time that sb have done sth；It /That/This was the...time that sb had done sth。“这是某人第几次做某事的时候了”；结合日常生活实际，能够计算到这是第几次做某事，表明该动作已经发生，因此，要用完成时态——主句用现在时，从句用现在完成时；主句用过去时，从句用过去完成时。本句前面使用了现在时，后面要使用现在完成时。第二句是时间状语从句，主句中用过去时，从句中也使用一般过去时。故D正确。
