______several times,they need encouragement.
A. Being failed
B. Having failed
C. To fail
D. To be failed
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After______in the street for two hours, the driver became furious.
A. having held up
B. having been held up
C. held up
D. being held up
Agriculture is the country's chief source of wealth,wheat______by far thebiggest cereal crop.(2003.TEM-4)
A. is
B. been
C. be
D. being
Upon being questioned,he denied______the article.
A. writing
B. to write
C. having written
D. to be written
That young man still denies______the fire behind the store.(2001.1.CET-4)
A. start
B. to start
C. having started
D. to have started