若是两条不同的直线，是三个不同的平面，则下列命题中正确命题是(     )

A：若，则

B：若，∥，则∥

C：若，9 to go. Just then an old man came and said, "Young man, I saw what you did to help the woman. I have a big company. I need a good young man like you. Would you like to 10for me?"