17. The new outline will throw light _______ students’ understanding of history.
| A．upon | B．at | C．of | D．Over |
Students taking the course _____to finish their homework with the help of computers．
| A．are encouraged | B．have encouraged |
| C．are encouraging | D．had been encouraged |
______ colorful charts and graphs, he loaded a new software to help him．
| A．Create | B．Created | C．Creating | D．To create |
Just hang the towel ______ the back of the chair so that it will dry soon．
| A．over | B．for | C．with | D．through |
—Have you seen your aunt lately?
—Yes, in fact I saw her yesterday．I ______ her for several months．
| A．haven't see | B．didn't see | C．hadn't seen | D．don't see |
I'll try it again．Never in my life _____ such a particular difficulty．
| A．had I met | B．have I met | C．I had met | D．I have met |