单项选择题

The staff members found it difficult （）the deadline

A. to meet  
B. having met
C. meeting  
D. met

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It's not enough （）that you love someone; you must show them

A. saying  
B. said
C. to say   
D. to saying
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My sister must have forgotten （）gasoline in the car

A. to putting 
B. to have put
C. putting  
D. to put
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