She said when she got to the cinema, the film ________ for 5 minutes.
A:has begun
B:had begun
C:has been on
D:had been on
已知:如图,△AOB的顶点O在直线l上,且AO=AB.
一个细胞有8条染色体,这个细胞连续分裂3次,形成的细胞数目和每个新细胞中的染色体数分别是( )