________ , they planned to go out for a picnic.

________ , they planned to go out for a picnic.

A.Being a nice day

B.Because the day was nice

C.It was a nice day

D.Because of a nice day

答案及解析： B

解析：

导解：A项非谓语动词的逻辑主语与主句不一致，C缺少连词，选B，用原因状语．