It is necessary the magazines in time.
A. to us to return
B. for us to return
C. to us returning
D. that we had returned
网友回答
A. to us to return
(答案→)B. for us to return
C. to us returning
D. that we had returned
解析：以It作形式主语或形式宾语引导的复合句结构中，如果这形容词指行为的性质。使用这样的句型：It+表行为性质的形容词+for sb.+不定式。