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He set at about 9 o'clock. [ ]A. about to work B. about to working C. about work

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He set at about 9 o'clock. [ ]A. about to work B. about to working C. about work

He set_________ at about 9 o'clock.     [     ]A. about to work                
B. about to working    
C. about working                
D. out working

试题答案

C