____all the required papers. he didn't answer the questions fluently in class.

A．Having not read

B．Not having read

C．Not read

D．Not to read

在有丝分裂过程中，细胞中的染色体数与DNA数不相等的时期(不考虑细胞器中的DNA)有[ ]

A．前期和中期

B．中期和后期

C．后期和末期

D．末期和间期