one billion people in the world,中国人考中国人的奇怪选择题1 whitchB whatC thatit's thought that one billion people in the world,__ is half the world's workers,earn their living by farming请详细回答`

one billion people in the world,中国人考中国人的奇怪选择题1 whitchB whatC thatit's thought that one billion people in the world,__ is half the world's workers,earn their living by farming请详细回答`
one billion people in the world,中国人考中国人的奇怪选择题
1 whitch
B what
C that
it's thought that one billion people in the world,__ is half the world's workers,earn their living by farming
请详细回答`

one billion people in the world,中国人考中国人的奇怪选择题1 whitchB whatC thatit's thought that one billion people in the world,__ is half the world's workers,earn their living by farming请详细回答`
It is thought that one billion people,that is half the world's workers,earn their living by farming.
据认为有十亿人,也就是全世界劳动人口的一半,是靠务农谋生的.
that is
那就是,即

which.非限定性定语从句。

二楼的对，他说的对。

which

1.which