问题标题：
ofwhich用法Thereareover58,000rockeyobjectsinspace,about___couldfalldownontotheearth.A.900ofwhichB.ofwhich900我好想记得我们老师说过ofwhichabout为什么
问题描述：
ofwhich用法
Thereareover58,000rockeyobjectsinspace,about___couldfalldownontotheearth.
A.900ofwhich
B.ofwhich900
我好想记得我们老师说过ofwhichabout
为什么
黄学智回答：
A
of 表示整体当中的一部分.about900ofwhich在这里可以换成ofwhichabout900.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：
Thehousewhosewindowfacessouthisbeautiful.窗户朝南的这栋房子很漂亮.
＝Thehousethewindowofwhichfacessouthisbeautiful.
=Thehouseofwhichthewindowfacessouthisbeautiful.
=Thehousewhichthewindowoffacessouthisbeautiful.
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