Stephen Hawking believes that the earth is unlikely to be th

Stephen Hawking believes that the earth is unlikely to be the only planet life has develop graduall
Stephen Hawking believes that the earth is unlikely to be the only planet life has develop gradually.
A.that B.where C.which D.whose
可是D为什么不行?
星球的生命,
They live in a room whose window opens to the south
不一定要人啊