What 's the difference between some of which, some of them or some of those?
Theorists realized that physics led to a plethora of new phenomena, ............. defy common sense.
1. some of which 2.some of them 3. some of those
The correct answer is 1. but why 2 and 3 is incorrect?
Is "which some of them" exactly equal to "some of which"?
Thanks.