Stephen Hawking believes that earth is unlikely to be the only planet life has developed

充值活动已开启，快来参与吧

当前位置：高中英语 / 句法 / 定语从句 / 关系副词引导定语从句的用法

1. Stephen Hawking believes that earth is unlikely to be the only planet life has developed gradually.

A . that B . where C . which D . whose