—Is there anything wrong with you, Jake? You look so pale．

—I feel very tired．I _____on this boring paper every day so far this month．

A．work

B．have been working

C．had been working

D．am working

严禁在机房内（）。

A、乱接临时电线

B、使用电炉

C、使用电热器等大功率电器

D、临时给手机充电

E、临时给笔记本电脑供电