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Mary is very shy. She found _____ difficult to speak in class.  

A. it       
B. that       
C. it is       
D. that is
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科目:初中英語 來源:同步題 題型:單選題

Mary is very shy. She found _____ difficult to speak in class.  
[     ]
A. it       
B. that       
C. it is       
D. that is

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