非谓语动词
24. 《2014北京》 __ carefully if any change occurs when doing experiments in the lab..
a. observe b. to observe
c. observed d. observing
《答案》a
25.《2014北京》 last night, there were millions of people _______ the opening ceremony live on tv.
a.watch b. to watch
c. watched d. watching
《答案》d
28. 《2014北京》there are still many problems ______ befor资源难易程度:★★★★★★★★★★★★★★★
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