—What’s up? You look down．　　

—I have piles of papers ________, but I type so slowly．

　 A．to be typed B．typed 　　　 C．to type　　 D．being typed

    —What’s up? You look down.

—I have piles of papers ______, but I type so slowly.

—What’s up? You look down.  —I have piles of papers ________, but I type so slowly.

—What’s up? You look down.  —I have piles of papers ________, but I type so slowly.

—What’s up? You look down.
—I have piles of papers ________, but I type so slowly.