flowers come out when spring comes 这句话的come out为什么不能换成open?

flowers come out when spring comes 这句话的come out为什么不能换成open? Flowers _____ when spring comes.A go out B open C come out D When __( 春天 ) comes,trees turn green and flowers come out.3Q In spring the flowers start to come out Flowers come out in spring 他们谁是主语,谓语,宾语? when spring (come),there (be)more flowers. will the flowers come out soon这句话用英语做肯定回答怎么说啊 In China, flowers come out the spring. People often go hikin In spring flowers _____(come) out and they _____(look) nice. After supper we come out and sit in the open air.这句话怎样翻译? Hair comes out ,and gloves come off come out的用法