a fine day, Shenzhou VI will be launched on time according to its planned time.

 ___________ a fine day, Shenzhou VI will be launched on time according to its planned time.

A. Being   B. It being  C. To be  D. It is

试题答案

B。 本题考查独立主格结构。前一分句和后一分句在逻辑上存在因果关系，可以排除答案D。因为前面的分词的逻辑主语不可能是后面一个分句的逻辑主语，故前一分句要有一个逻辑主语it表示天气。