Do let my mother know all the truth. She appears __________everything.    
[     ]
A. to tell                      
B. to be told    
C. to be telling                
D. to have been told
He seems _________the homework, for he was taking a walk on the playground.    
[     ]
A. has finished    
B. to have finished    
C. to finish        
D. finished
— Have you heard of Loulan?
— Of course. It is believed _____ many years ago.
[      ]
A. that it covered over by sandstorms
B. that it is covered over by sandstorms
C. to be covered over by sandstorms
D. to have been covered over by sandstorms
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