He went to Shanghai ___________ September , and came back ______ the morning _________ October 4.

A．in , in , on

B．in , in ,of

C．in , on , on

D．on , in , of

2.6×765+76.5×33+7.65×310+7650×0.1等于______。

A．7.65

B．76.5

C．765

D．7650