Question

of which 用法

There are over 58,000 rockey objects in space, about___ could fall down onto the earth.

A.900 of which
B.of which 900

我好想记得我们老师说过of which about 900对不对？

为什么

Answer 1

A
of　表示整体当中的一部分。about 900 of which在这里可以换成of which about 900。因为介词+关系代词可以引导定语从句。

如果表示的是所属关系，则有四种说法。如：
The house whose window faces south is beautiful. 窗户朝南的这栋房子很漂亮。
＝The house the window of which faces south is beautiful.
= The house of which the window faces south is beautiful.
=The house which the window of faces south is beautiful.