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It is the protection for the trees___________ really  matters, rather than how many trees are planted.  

A. what       B. that  C. 不填      D. which

It is the protection for the trees___________ really  matters, rather than how many trees are planted.  

A. what                      B. that

C. 不填                      D. which

It is the protection for the trees___________ really  matters, rather than how many trees are planted.

A. what                 B. that    C. 不填                  D. which

It is the protection for the trees______ really  matters, rather than how many trees are planted.

A. what          B. that         C. 不填         D. which

It is the protection for the trees___________ really  matters, rather than how many trees are planted．

       A．what                           B．that

       C．不填                           D．which