第二部分知识运用（共两节，满分20分）
第一节单项填空（共10小题；每小题1分，满分10分）
从A、B、C、D四个选项中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
21. When I got up that morning, I found ________ elephant standing by the window.
A. a B. an C. the D. 不填
I have been living in the United States for 20 years, but seldom ______ so lonely as now.
| A．have I felt | B．I had felt | C．I have felt | D．had I felt |
—How was your trip to London?
—Great. I was helped by an organization. Otherwise, I ______ it.
| A．wouldn’t afford | B．hadn’t afforded |
| C．wouldn’t have afforded | D．needn’t have afforded |
Our coach says we won’t keep winning games ______ we keep playing well.
| A．because | B．unless | C．when | D．while |
Many people believe that hunger is only a problem in the developing world. ______, it is a problem all over the world.
| A．For one thing | B．In addition | C．As well | D．On the contrary |
Give me an undisturbed hour and I ______ the work Tom has left unfinished.
| A．see to | B．will see to | C．would be seeing to | D．have seen to |