----.Let’s go to find our manager in his office.

----It’s so late at night .He          be there . Let’s make it another day .

A．can’t

B．needn’t

C．mustn’t

D．ought not to have been

在EXCEL中插入的图表，可以根据自己的喜好和需要，选择图表的背景、色彩字体等修饰图表。