--- May I visit you at 10 o’clock tomorrow morning?

--- I’m afraid I ______ a document for my boss then. What about 12:00?

A．am preparing

B．will have prepared

C．will be preparing

D．have been preparing

某型号打印机与计算机的连接插头如图2-1所示，该插头可以连接到主板的 (5) 。

A．并行接口

B．COM接口

C．RJ--45接口

D．USB接口