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____ more attention, the trees could have grown better.

     A. Given             B. To give            C. Giving            D. Having given

_____ more attention, the trees could have grown better.

A. Given           B. To give       C. Giving       D. Having given 

____ more attention, the trees could have grown better.
A. Given B. To give C. Giving D. Having given

____ more attention, the trees could have grown better.
A. Given B. To give C. Giving D. Having given

______ more attention, the trees could have grown better.

A. Given　　　 B. To give　　

C. Giving　　　 D. Having given