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【单选题】Only in my thirties __________a purpose in life.

A.
I found    
B.
found I    
C.
I did find  
D.
did I find

【单选题】__________ his telephone number, she didn’t know how to get in touch with him.

A.
Forgetting             
B.
To  forget
C.
To have forgotten   
D.
Having forgotten