Shanghai is most beautiful city and I believe I will come for second visit .A. the; theB.

问题补充：

Shanghai is most beautiful city and I believe I will come for second visit .

A. the; the

B. a; a

C. /; the

D. a; /

答案：

A. the; the

(答案→)B. a; a

C. /; the

D. a; /

解析：考察冠词.上文最高级缺少比较范围,可知此处不是最高级,根据句意上海是一个十分美丽的城市,most前用不定冠词,我要来一个二次参观,这里是泛指,故选B.