问答题

A、B、C、D四个带电体，已知D带正电，A和C互相排斥，C和B互相吸引，而B和D也互相排斥，则：
[ ]
A．A、C带正电，B带负电
B．A、C带负电，B带正电
C．B、C带正电，A带负电
D．A所带电性不能确定

A.A、C带正电，B带负电
B.A、C带负电，B带正电
C.B、C带正电，A带负电
D.A所带电性不能确定

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