The children, had played the whole day long, were worn out.A. all of whatB. all of whichC.

The children, had played the whole day long, were worn out.
A. all of what
B. all of which
C. all of them
D. all of whom

A. all of whatB. all of whichC. all of themD. all of whom解析：句意：孩子们都累坏了，他们都玩了一整天。非限定定语从句，关系代词指人且在介词之后故用whom。【考点定位】定语从句关系词的选用。注意C项，原句主干 children were worn out，即为完整的句子，那么空白处需要填连词用以构成从句，故C项的代词不能选择。

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