—Has William finished writing his graduation paper yet?

—I don’t know exactly，but he __________all day.

A．is writing

B．has been writing

C．was writing

D．wrote

国内特快邮件短少缮写验单后，下列不能作为随验单附寄的相关证物的是（）。

A.相关内件短少邮件

B.封志

C.绳扣

D.清单复印件